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Cross-site Scripting (XSS)Weakness · CWE-79

CVE-2026-43878

MEDIUM · 6.1 CVSS v3.1 Published 2026-05-11
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/Meet/iframe.php echoes the attacker-controlled user and pass query parameters unescaped into a JavaScript double-quoted string literal inside a <script> block. An attacker who sends a victim to a crafted URL can break out of the string and execute arbitrary JavaScript in the victim's browser in the context of the AVideo origin. No authentication is required if a public Meet schedule exists on the target. Commit 3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b contains an updated fix.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Next version after 29.0 (check AVideo GitHub releases for the first version containing commit 3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b)

  1. 1. Identify the current AVideo installation version (likely 29.0 or earlier based on the CVE description)
  2. 2. Navigate to the official AVideo releases page or GitHub repository to determine the next version release after 29.0 that includes the fix commit 3298ced2bcf92e4f3acff6ce9bde14edf42ecb5b
  3. 3. Review release notes for the fixed version to confirm the XSS vulnerability (CVE-2026-43878) is addressed
  4. 4. Create a full backup of the AVideo installation including database and files
  5. 5. Test the upgrade in a staging environment before applying to production
  6. 6. Apply the upgrade following standard AVideo upgrade procedures
  7. 7. Verify the plugin/Meet/iframe.php file now properly escapes or encodes the user and pass parameters before inserting into JavaScript
  8. 8. Confirm the fix by testing that crafted XSS payloads in user/pass parameters are neutralized
Caveat Review release notes for any breaking changes between version 29.0 and the target upgrade version; standard upgrade risks apply

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-43878 in production — separate from our analysis above.

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