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TI-2026-21962 Aliases CVE-2026-27568GHSA-rcqw-6466-3mv7

AVideo has Stored Cross-Site Scripting via Markdown Comment Injection

Priority LOW 23CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00264 18th percentileScored 2026-11-07
Fix Fixed AVideo (WWBN): 21.0wwbn/avideo (Packagist): 21.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WWBNAVideobefore 21.021.0Patch availableCNA
—wwbn/avideo (Packagist)before 21.021.0Patch availableGHSA-rcqw-6466-3mv7
  • AVideo VendorWWBN Affected before 21.0 Fixed in 21.0 Patch available CNA
  • wwbn/avideo (Packagist) Vendor— Affected before 21.0 Fixed in 21.0 Patch available GHSA-rcqw-6466-3mv7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*before 21.0VulnerableWWBN
  • cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:* Versions before 21.0 Vulnerable ·WWBN

Remediation

  • Fix · CNA AVideo (WWBN) Fixed in 21.0
  • Fix · GHSA-rcqw-6466-3mv7 wwbn/avideo (Packagist) Fixed in 21.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27568
  2. 2026-10-03 Alias added: GHSA-rcqw-6466-3mv7

References

Patch 1

Advisory 2

Other 2

  • TI-2026-29567 Code injection in WWBN AVideo CVSS 3.1CRITICAL 10.0
  • TI-2026-26095 AVideo Allows Unauthenticated Live Stream Control via Token Verification URL Override in control.json.php CVSS 3.1CRITICAL 9.4
  • TI-2026-25874 Improper access control in WWBN AVideo CVSS 3.1CRITICAL 10.0
  • TI-2026-25758 AVideo has an Unauthenticated SQL Injection via `doNotShowCats` Parameter (Backslash Escape Bypass) CVSS 3.1CRITICAL 9.8
  • TI-2024-20951 An issue in WWBN AVideo v.12.4 through v.14.2 allows a remote attacker to execute… CVSS 3.1CRITICAL 9.8
  • TI-2023-10706 OS injection vulnerability in World Wide Broadcast Network AVideo version before 12.4… CVSS 3.1CRITICAL 9.8
See all 189 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences