CVE-2026-107623 Keycloak-services: keycloak-services: oidc dcr read-modify-write silently disables offline token revocation
A serialization bug in Keycloak's OIDC DCR component silently disables offline token revocation, allowing tokens to remain valid after backchannel logout.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107623?
CVE-2026-107623 is a medium-severity missing authorization vulnerability in Red Hat Build of Keycloak, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in the OIDC Dynamic Client Registration (DCR) component of Keycloak. A bug in the response serialization causes the backchannel logout offline token revocation setting to be omitted from responses. When a client performs a standard update, this missing information causes the setting to be silently disabled. As a result, offline tokens may remain valid even after a user session is terminated via backchannel logout.
Weakness: CWE-862
Which versions are affected by CVE-2026-107623?
How do I fix CVE-2026-107623?
No fix has been published for CVE-2026-107623 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-107623 being exploited?
There is no known exploitation of CVE-2026-107623 in the wild and no public exploit code.
Sources
Also known as GHSA-qxj8-968q-qm7w.