CVE-2026-90561 Strapi - Stored XSS

Strapi 4.x < 4.26.3 and 5.x < 5.48.1 contain a stored XSS caused by failure to strip script tags in content manager WYSIWYG preview, letting Author-role users execute scripts in Editor or Super Admin sessions, exploit requires Author-role access.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.43% 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
13 September 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Upgrade to version 4.26.3 or 5.48.1 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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