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OpenAdvisories
High · 8.7 CVE-2026-54049 EUVD-2026-91027GHSA-w2x5-gv52-9ccv

Sakai Conversations has a Stored XSS Issue

Published Oct 1, 2026 · Updated Oct 6, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
sakaiproject sakai >= 23.0, < 23.5, >= 25.0, < 25.3 —

Affected packages

References