{"cve":"CVE-2026-54049","nvd":{"published":"2026-10-01T20:17:25.587","modified":"2026-10-06T03:17:03.230","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":8.7},"cwes":["CWE-79"],"references":["https://github.com/sakaiproject/sakai/commit/2696b4b48cbef2e81512f52f84f7477adff78b27","https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv","https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:57:46.668721662+00:00"},"epss":{"cve":"CVE-2026-54049","score":0.00323,"percentile":0.25078,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-w2x5-gv52-9ccv","url":"https://osv.dev/vulnerability/GHSA-w2x5-gv52-9ccv","summary":"Sakai Conversations has a Stored XSS Issue","modified":"2026-08-24T19:56:00.541458Z","packages":[{"ecosystem":"Maven","name":"org.sakaiproject.conversations:sakai-conversations-impl","purl":"pkg:maven/org.sakaiproject.conversations/sakai-conversations-impl","ranges":[">=23.0 <=23.3"],"fixed":[]},{"ecosystem":"Maven","name":"org.sakaiproject.kernel:sakai-kernel-impl","purl":"pkg:maven/org.sakaiproject.kernel/sakai-kernel-impl","ranges":[">=23.0 <=23.3"],"fixed":[]},{"ecosystem":"Maven","name":"org.sakaiproject.rubrics:rubrics-impl","purl":"pkg:maven/org.sakaiproject.rubrics/rubrics-impl","ranges":[">=23.0 <=23.3"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}