CVE-2026-6647 WSO2 Identity Server - Access Control Bypass

WSO2 Identity Server with case-insensitive user store and case-sensitive identity database contains an access control bypass caused by inconsistent username case handling, letting attackers with valid tokens bypass token revocation, exploit requires valid access or refresh token with mixed-case username.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Access Control Bypass
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-613

Vendor fix

Update to the latest version of WSO2 Identity Server that addresses username case handling inconsistencies.

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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