{"id":"CVE-2026-54049","published":"2026-10-01T20:17:25.587","lastModified":"2026-10-06T03:17:03.230","description":"Sakai is a Collaboration and Learning Environment (CLE). From versions 23.0 to before 23.5, and versions 25.0 to before 25.3, the Sakai Conversations tool stores topic and post messages without HTML sanitization, and the frontend renders them using LitElement's unsafeHTML() directive, resulting in stored cross-site scripting (XSS). Any authenticated user with access to a site that has the Conversations tool enabled can inject arbitrary HTML and JavaScript that executes in the browsers of all other users who view that topic or post. This issue has been patched in versions 23.5, 25.3, and 26.0.","cvssScore":8.7,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/sakaiproject/sakai/commit/2696b4b48cbef2e81512f52f84f7477adff78b27","tags":[]},{"url":"https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv","tags":[]},{"url":"https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv","tags":[]}],"exploitRefs":[{"url":"https://github.com/sakaiproject/sakai/commit/2696b4b48cbef2e81512f52f84f7477adff78b27","tags":[]},{"url":"https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv","tags":[]},{"url":"https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows an attacker to inject arbitrary HTML and JavaScript into Sakai Conversations, leading to cross-site scripting (XSS) attacks.","exploitability":"Exploitation is relatively easy for an attacker with access to a site using the Conversations tool, as any authenticated user can inject malicious content.","blast_radius":"If exploited, the XSS attack can affect all users viewing the affected topic or post, potentially leading to data theft or further attacks.","remediation":"Upgrade to Sakai version 23.5, 25.3, or 26.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["xss","web","auth-required","sakai"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-03T08:56:00.399Z"}}