---
title: "CVE-2026-54049: Sakai - Stored XSS"
description: "Sakai 23.0 < 23.5, 25.0 < 25.3 contains a stored XSS caused by lack of HTML sanitization in Conversations tool messages and unsafe rendering with LitElement's unsafeHTML(), letting authenticated users inject arbitrary scripts executed by other users, exploit requires authenticated user access to Conversations tool."
url: https://panop.io/threat-heartbeat/CVE-2026-54049/
---

# CVE-2026-54049 Sakai - Stored XSS

Sakai 23.0 < 23.5, 25.0 < 25.3 contains a stored XSS caused by lack of HTML sanitization in Conversations tool messages and unsafe rendering with LitElement's unsafeHTML(), letting authenticated users inject arbitrary scripts executed by other users, exploit requires authenticated user access to Conversations tool.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.26% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-54049)

## Details

Type

Stored XSS

Impact

Stored XSS

CVSS vector

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

Published

1 October 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to versions 23.5, 25.3, 26.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-54049](https://nvd.nist.gov/vuln/detail/CVE-2026-54049)
- [https://github.com/sakaiproject/sakai/commit/2696b4b48cbef2e81512f52f84f7477adff78b27](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)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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