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 ↗

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

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

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