CVE-2026-2603A flaw was found in Keycloak.
Updated under an hour ago ()
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It affects redhat build_of_keycloak. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
- CVSS
- 8.1 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-306
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
redhat build_of_keycloak redhat:build_of_keycloak | from 26.2 before 26.2.14; from 26.4 before 26.4.10 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:3925vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3926vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3947vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3948vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-2603vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300exploit, issue-tracking, vendor-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2603.jsonvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.