{"id":"CVE-2026-27568","aliases":["EUVD-2026-8522","GHSA-rcqw-6466-3mv7"],"status":"published","title":"AVideo has Stored Cross-Site Scripting via Markdown Comment Injection","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.","severity":{"version":"4.0","score":5.1,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00264,"percentile":0.18532,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-02-20T21:15:06Z","modified":"2026-10-28T02:30:52Z","fixes":[{"ecosystem":"Packagist","package":"wwbn/avideo","fixed_in":["21.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"wwbn/avideo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"wwbn/avideo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21.0"}]}],"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"]}],"products":[{"vendor":"wwbn","product":"avideo"}],"references":[{"url":"https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/WWBN/AVideo/releases/tag/21.0","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27568","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rcqw-6466-3mv7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27568.json","tags":["advisory"]},{"url":"https://github.com/WWBN/AVideo","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-27568","title":"AVideo has Stored Cross-Site Scripting via Markdown Comment Injection","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.","status":"published","published":"2026-02-24T14:53:20.826Z","modified":"2026-02-27T19:00:21.74Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:19:49.199185Z"}],"euvd":[{"id":"EUVD-2026-8522","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.","status":"published","published":"2026-02-24T14:53:20Z","modified":"2026-02-27T19:00:21Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"updated_at":"2026-11-02T19:48:13.609806Z"}],"ghsa":[{"id":"GHSA-rcqw-6466-3mv7","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/).","status":"published","published":"2026-02-20T21:15:06Z","modified":"2026-02-24T16:27:03Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:39:27.949248Z"}],"nvd":[{"id":"CVE-2026-27568","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.","status":"published","published":"2026-02-24T15:21:38.843Z","modified":"2026-06-17T10:27:19.407Z","cvss":[{"version":"4.0","score":5.1,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:07.027269Z"}],"osv":[{"id":"CVE-2026-27568","title":"AVideo has Stored Cross-Site Scripting via Markdown Comment Injection","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.","status":"published","published":"2026-02-24T14:53:20.826Z","modified":"2026-10-28T02:30:52.493031013Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:00.180685Z"},{"id":"GHSA-rcqw-6466-3mv7","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/).","status":"published","published":"2026-02-20T21:15:06Z","modified":"2026-02-24T16:34:57.675522Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:55.877614Z"}]}}