CVE-2026-27568: Wwbn/avideo Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-rcqw-6466-3mv7
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CWE-79
Published
Advisory Summary

CVE-2026-27568 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Wwbn/avideo libraries in the Packagist ecosystem. The issue involves avideo has stored cross-site scripting via markdown comment injection. Remediation is available by upgrading affected packages to version 21.0.

CVE-2026-27568 at a Glance

CVE Identifier CVE-2026-27568
GHSA Identifier GHSA-rcqw-6466-3mv7
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Wwbn/avideo
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-27568

To remediate this vulnerability, upgrade all affected Wwbn/avideo dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

wwbn/avideo fixed: 21.0 
Upgrade wwbn/avideo to 21.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for wwbn/avideo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-27568, inspect your project dependencies for Wwbn/avideo:

inspect dependencies for wwbn/avideo

Analyze the terminal output to locate any version of Wwbn/avideo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 21.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Wwbn/avideo, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Vulnerability Type Stored Cross-Site Scripting (XSS) — CWE-79. ## Affected Product/Versions AVideo 18.0. ## Root Cause Summary 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. ## Impact Summary 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. ## Resolution/Fix The issue was confirmed and fixed in the master branch. An official release will be published soon. ## Workarounds Until the release is available, validate and block unsafe URI schemes (e.g., `javascript:`) before rendering Markdown, and enable Parsedown Safe Mode. ## Credits/Acknowledgement Reported by Arkadiusz Marta (https://github.com/arkmarta/).

CVE-2026-27568 Affected Wwbn/avideo Versions

1 component(s)
Fixed Versions:
21.0
Product / Package Ecosystem Affected Versions Fixed Version
wwbn/avideo
 Packagist
< 21.0
21.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7
NVD — CVE-2026-27568 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27568
Security Fix Commit FIX COMMIT
https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7
Wwbn/avideo Source Repository REPOSITORY
https://github.com/WWBN/AVideo
Wwbn/avideo Release RELEASE
https://github.com/WWBN/AVideo/releases/tag/21.0

Frequently Asked Questions

What is CVE-2026-27568?
CVE-2026-27568 is a security vulnerability in Wwbn/avideo involving AVideo has Stored Cross-Site Scripting via Markdown Comment Injection under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Wwbn/avideo versions are affected?
Affected versions include releases prior to 21.0 across affected packages: wwbn/avideo.
What version fixes CVE-2026-27568?
Upgrading to 21.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is wwbn/avideo affected?
Yes, wwbn/avideo is affected in releases prior to 21.0. Upgrade your dependency to 21.0 or later.
What CWE is associated with CVE-2026-27568?
CVE-2026-27568 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2026-27568?
Run the dependency tree command: 'inspect dependencies for wwbn/avideo'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rcqw-6466-3mv7",
  "modified" : "2026-02-24T16:27:02Z",
  "published" : "2026-02-20T21:15:06Z",
  "aliases" : [ "CVE-2026-27568" ],
  "summary" : "AVideo has Stored Cross-Site Scripting via Markdown Comment Injection",
  "details" : "## Vulnerability Type\nStored Cross-Site Scripting (XSS) — CWE-79.\n\n## Affected Product/Versions\nAVideo 18.0.\n\n## Root Cause Summary\nAVideo 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.\n\n## Impact Summary\nAn 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.\n\n## Resolution/Fix\nThe issue was confirmed and fixed in the master branch. An official release will be published soon.\n\n## Workarounds\nUntil the release is available, validate and block unsafe URI schemes (e.g., `javascript:`) before rendering Markdown, and enable Parsedown Safe Mode.\n\n## Credits/Acknowledgement\nReported by Arkadiusz Marta (https://github.com/arkmarta/).",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wwbn/avideo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27568"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/releases/tag/21.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-20T21:15:06Z",
    "nvd_published_at" : "2026-02-24T15:21:38Z"
  }
}