XSS in Sakaiproject Sakai
CVE-2026-54049
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Sakaiproject Sakai — versions >= 23.0, < 23.5, >= 25.0, < 25.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-54049?
- CVE-2026-54049 is a high-severity vulnerability in Sakaiproject Sakai, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-10-01.
- How severe is CVE-2026-54049?
- High severity. CVSS v3 base score is 8.7 out of 10.