WWBN AVideo has an incomplete fix for CVE-2026-33500: XSS

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-41063: 0.22% estimated exploitation activity in the next 30 days; percentile 12.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The incomplete XSS fix in AVideo's ParsedownSafeWithLinks class overrides inlineMarkup for raw HTML but does not override inlineLink() or inlineUrlTag(), allowing javascript: URLs in markdown link syntax to bypass sanitization. Affected Package - Ecosystem: Other - Package: AVideo - Affected versions: < commit 3ae02fa24093 - Patched versions: = commit 3ae02fa24093 Details In objects/functionsSecurity.php, the ParsedownSafeWithLinks class: - Overrides blockMarkup() -- blocks non-<a/<img HTML tags - Overrides inlineMarkup() -- sanitizes <a href=... and <img src=... in raw HTML, including an href whitelist But the base Parsedown.php class has two additional methods that generate <a tags: - inlineLink() (line ~1388) -- processes text markdown syntax, sets href = URL directly - inlineUrlTag() (line ~1558) -- processes <URL auto-link syntax, sets href = URL directly Neither is overridden by ParsedownSafeWithLinks, so Click me) produces <a…

Published by the source

14 Apr 2026, 23:25 UTC

Last modified by the source

24 Apr 2026, 20:41 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-m7r8-6q9j-m2hc

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# Patch Next advisory brief: CVE-2026-41063

Advisory: WWBN AVideo has an incomplete fix for CVE-2026-33500: XSS
IDs: CVE-2026-41063, GHSA-m7r8-6q9j-m2hc
Record: https://patchnext.com/advisories/cve-2026-41063 (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist wwbn/avideo: affected <= 29.0

## Suggested inspection (read-only)
- Packagist wwbn/avideo: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on wwbn/avideo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-m7r8-6q9j-m2hc (GitHub-reviewed advisory GHSA-m7r8-6q9j-m2hc lists affected ranges: Packagist wwbn/avideo >=0 <=29.0)

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