{"id":"CVE-2026-27568","aliases":["GHSA-rcqw-6466-3mv7"],"url":"https://o3.security/vulnerability/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/).","published":"2026-02-24T14:53:20.826Z","modified":"2026-08-12T03:51:47.129157609Z","cvss":null,"epss":{"score":0.00229,"percentile":0.13678,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"wwbn/avideo","fixedVersion":"21.0"}],"fix":{"url":"https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7","label":"WWBN/AVideo@ade348e"},"references":[{"type":"WEB","url":"https://github.com/WWBN/AVideo/releases/tag/21.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27568.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7"},{"type":"PACKAGE","url":"https://github.com/WWBN/AVideo"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.129157609Z"}}