CVE-2026-1190 Keycloak's missing timestamp validation allows attackers to extend SAML response validity periods
Attackers can extend SAML response validity by bypassing NotOnOrAfter checks, causing resource consumption or unexpected session durations in Keycloak SAML brokering.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-1190?
CVE-2026-1190 is a low-severity vulnerability in Red Hat JBoss Enterprise Application Platform 8, published on 26 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.
Weakness: CWE-112
Which versions are affected by CVE-2026-1190?
2 open source packages ship an affected version, including org.keycloak:keycloak-services.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions to 26.5.2 | None |
org.keycloak:keycloak-services Maven | All versions to 26.5.2 | None |
How do I fix CVE-2026-1190?
Apply the vendor's patch.
Is CVE-2026-1190 being exploited?
There is no known exploitation of CVE-2026-1190 in the wild and no public exploit code.
Sources
Also known as GHSA-63v5-26vq-m4vm, MINI-7c8j-37gv-5342, MINI-94v9-hj8h-68rf.