CVE-2026-6647 In deployments of WSO2 Identity Server configured with a case-insensitive user store and a case-sensitive database for identity data, mismat
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-6647?
CVE-2026-6647 is a high-severity vulnerability in WSO2 Carbon OAuth, published on 28 Oct 2026.
Official description
In deployments of WSO2 Identity Server configured with a case-insensitive user store and a case-sensitive database for identity data, mismatches in username case handling can occur. This inconsistency results in OAuth token revocation operations failing to correctly identify usernames containing mixed-case characters during certain lifecycle events, preventing tokens from being invalidated.
A malicious actor can exploit this vulnerability by possessing a valid access or refresh token associated with a mixed-case username. In affected configurations, these tokens may not be revoked when expected. The actor can then leverage these unrevoked tokens, before their expiry, to continue performing actions that should have been restricted, effectively bypassing intended access controls.
Weakness: CWE-613
Which versions are affected by CVE-2026-6647?
How do I fix CVE-2026-6647?
No fix has been published for CVE-2026-6647 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6647 being exploited?
There is no known exploitation of CVE-2026-6647 in the wild and no public exploit code.
Sources
Also known as GHSA-rxrw-f2xj-7fjx.