CVE-2026-2603: Missing Authentication for Critical Function in Red Hat Red Hat build of Keycloak 26.2
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-2603 in Red Hat build of Keycloak 26.2 involves missing authentication for a critical function. Specifically, a remote attacker can bypass security controls by submitting a valid SAML response from an external Identity Provider to the Keycloak SAML endpoint used for IdP-initiated broker logins. This bypass allows completion of broker logins even if the SAML Identity Provider is disabled, resulting in unauthorized authentication. The issue is tracked under CWE-306 (Missing Authentication for Critical Function). Red Hat has published security advisories and released updated Keycloak 26.2.14 images that fix this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an attacker with network access to the Keycloak SAML endpoint to authenticate without proper authorization, bypassing disabled SAML Identity Provider restrictions. This leads to unauthorized access with potentially high confidentiality and integrity impact, as indicated by the CVSS score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). There is no known exploitation in the wild at this time.
Mitigation Recommendations
Red Hat has released fixed versions of the Red Hat build of Keycloak 26.2.14 that address this vulnerability. Users should upgrade to version 26.2.14 or later. Before applying the update, it is recommended to back up existing installations, including applications, configuration files, and databases. No other mitigation or workaround is specified in the vendor advisories.
CVE-2026-2603: Missing Authentication for Critical Function in Red Hat Red Hat build of Keycloak 26.2
Description
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 v3.1
Score 8.1high
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-2603 in Red Hat build of Keycloak 26.2 involves missing authentication for a critical function. Specifically, a remote attacker can bypass security controls by submitting a valid SAML response from an external Identity Provider to the Keycloak SAML endpoint used for IdP-initiated broker logins. This bypass allows completion of broker logins even if the SAML Identity Provider is disabled, resulting in unauthorized authentication. The issue is tracked under CWE-306 (Missing Authentication for Critical Function). Red Hat has published security advisories and released updated Keycloak 26.2.14 images that fix this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an attacker with network access to the Keycloak SAML endpoint to authenticate without proper authorization, bypassing disabled SAML Identity Provider restrictions. This leads to unauthorized access with potentially high confidentiality and integrity impact, as indicated by the CVSS score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). There is no known exploitation in the wild at this time.
Mitigation Recommendations
Red Hat has released fixed versions of the Red Hat build of Keycloak 26.2.14 that address this vulnerability. Users should upgrade to version 26.2.14 or later. Before applying the update, it is recommended to back up existing installations, including applications, configuration files, and databases. No other mitigation or workaround is specified in the vendor advisories.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-02-16T21:18:50.125Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/errata/RHSA-2026:3925","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:3926","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:3947","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:3948","vendor":"Red Hat"},{"url":"https://access.redhat.com/security/cve/CVE-2026-2603","vendor":"Red Hat"}]
Threat ID: 69b9ffb5771bdb174905670b
Added to database: 03/18/2026, 01:28:21 UTC
Last enriched: 07/15/2026, 08:50:13 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 244
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.