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.

CVSS 3.1

8.7CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-10-01

Modified

2026-10-06

Record from

the NVD, synced 2026-10-19

Packages (OSV)

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

Check your stackJSON