{"id":"GHSA-rcqw-6466-3mv7","aliases":["CVE-2026-27568"],"title":"AVideo has Stored Cross-Site Scripting via Markdown Comment Injection","description":"## 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":"medium","score":5.1,"published":"2026-02-20T21:15:06.000Z","modified":"2026-02-24T16:34:57.675Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"wwbn/avideo","ranges":[{"events":[{"introduced":"0"},{"fixed":"21.0"}],"type":"ECOSYSTEM"}],"versions":["10.4","10.8","11","11.1","11.1.1","11.5","11.6","12.4","14.3","14.3.1","14.4","18.0"],"fixed":["21.0"]}],"references":["https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7","https://nvd.nist.gov/vuln/detail/CVE-2026-27568","https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7","https://github.com/WWBN/AVideo","https://github.com/WWBN/AVideo/releases/tag/21.0"],"sources":[{"name":"OSV","id":"GHSA-rcqw-6466-3mv7","modified":"2026-02-24T16:34:57.675522Z","url":"https://osv.dev/vulnerability/GHSA-rcqw-6466-3mv7"}],"assessments":[{"source":"OSV","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","score":5.1}]}