EUVD-2026-88642
GHSA-m473-fq7f-v95f
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft malicious search-param URL
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DeliveryDeliver link to victim (phish/chat)
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ExploitVictim opens users.php link
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ExecutionUnescaped reflection into page
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ImpactScript executes in victim browser session
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Requires a victim to open an attacker-crafted URL pointing at a live instance's users.php with a payload in the 'search' GET parameter (UI:P). Exploitation is reflected/non-persistent, so the attacker must deliver the link per-victim rather than plant a stored payload. No authentication is needed to trigger the reflection (PR:N), but meaningful impact depends on a targeted user (ideally an authenticated admin) opening the link in the context of a deployed instance of this niche personal website. |
| Impact | This is a reflected cross-site scripting flaw (CWE-79) whose real-world risk is LOW despite a network attack vector. The source-code diff independently confirms the root cause: users.php echoes $_GET['search'] directly into an <input value> attribute and into href attributes without encoding, and the patch simply wraps it in htmlspecialchars() - so the vulnerability is genuine and verified, not merely asserted. The vendor CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:P/VC:N/VI:L/VA:N) correctly captures a low-impact, integrity-only issue requiring victim interaction (UI:P), and E:P marks a proof-of-concept. A public exploit exists (GitHub issue #8) but there is NO EPSS score, NO CISA KEV listing, and NO evidence of active exploitation - POC availability is a distinct and weaker signal than in-the-wild use. The dominant risk-limiting factor is prevalence, not severity: this is a single developer's personal homepage project, so even a working exploit affects a negligible install base. Net: real but trivial-priority. |
| Exploit ScenarioDerived | An attacker crafts a URL to a victim instance's users.php with a malicious payload in the search parameter (e.g. search="><script>...</script>) and lures a logged-in user or admin into clicking it. Because the value is reflected unescaped into the search input field and pagination links, the script executes in the victim's browser session. A public proof-of-concept is available via GitHub issue #8, and the CVSS UI:P requirement means one user click is needed. |
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Alert meAnalysisAIv1 – Sep 29, 2026
Reflected cross-site scripting in the users.php script of coolbeans1212's MateisHomePage-Website lets remote, unauthenticated attackers inject arbitrary JavaScript into a page rendered to a victim who opens a crafted link. A successful attack requires the victim to click an attacker-supplied URL containing a payload in the 'search' GET parameter (CVSS:4.0 UI:P), so the flaw is non-persistent and must be delivered per victim rather than planted once. Publicly available exploit code exists and the issue has been publicly disclosed alongside a vendor commit, but there is no evidence of confirmed active exploitation (no CISA KEV listing); the independently assessed risk is LOW despite the network attack vector, because the product is a niche personal website and impact is limited to script execution in the victim's browser session (C:L/I:L, S:C).
RemediationAI
Apply the upstream fix commit 6406308df9771d2fd477b56dafe4878dd846df6e from https://github.com/coolbeans1212/MateisHomePage-Website/commit/6406308df9771d2fd477b56dafe4878dd846df6e, which wraps every echo of $_GET['search'] in users.php with htmlspecialchars(); because this project ships as a rolling release with no tagged versions, deployment means pulling the latest commit rather than upgrading to a numbered release, and the patched build must be verified against the specific commit hash. No CVSS-versioned vendor advisory with a separate fix version exists, so treat the commit as the authoritative patch. Where immediate code change is not possible, the most effective compensating control is to stop exposing the site to untrusted users - place it behind authentication or an IP allowlist, or restrict it to a local/reverse-proxied environment - at the cost of losing public access to the page. A Content-Security-Policy header that disallows inline and untrusted scripts meaningfully reduces exploitability but does not remove the underlying reflection and can break legitimate page functionality; likewise, server-side input filtering or WAF rules matching script-bearing 'search' parameters reduce noise but are bypassable and should not substitute for encoding output at the sink. Because the vulnerable pattern echoes request data directly into attributes in multiple places, audit the rest of the codebase for the same anti-pattern before considering the site remediated.
Affected VersionsENISA
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Technical ContextAI · show details
The affected code is a PHP page (users.php) in a personal website project maintained by GitHub user coolbeans1212, distributed as a rolling release with continuous delivery, which means no discrete version numbers exist for affected or fixed builds. Root cause is CWE-79 improper neutralization of input during web page generation: the value of $_GET['search'] is echoed directly into HTML in at least three places - the href of the 'Previous' pagination link, the value attribute of the search input field, and the href of the 'Next' pagination link - so a crafted query string breaks out of the attribute context and executes script. The vendor fix (commit 6406308df9771d2fd477b56dafe4878dd846df6e) applies htmlspecialchars() to all three echo sites, which is the standard PHP output-encoding mitigation for this class. Because the sink is a reflected GET parameter, exploitation is non-persistent: the attacker must lure a target to a live instance's users.php with the payload in the URL. CPE data (cpe:2.3:a:coolbeans1212:mateishomepage-website:*:*:*:*:*:*:*:*) confirms a wildcard version range, consistent with the rolling-release model. The independently assessed vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) confirms no authentication is needed to trigger the reflection, requires victim interaction, and scopes the impact to the browser session rather than the server.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Reflected XSS needs a victim click (UI:R) but no auth (PR:N); script runs in the victim's browser context crossing the app trust boundary (S:C) with limited confidentiality/integrity impact.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
A flaw has been found in coolbeans1212 MateisHomePage-Website up to ea2a4226deeca27ab1fb9df0552ec76444547811. Affected by this issue is some unknown functionality of the file users.php. This manipulation of the argument Search causes cross site scripting. The attack can be initiated remotely. The exploit has been published and may be used. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. Patch name: 6406308df9771d2fd477b56dafe4878dd846df6e. Applying a patch is the recommended action to fix this issue.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
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.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
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