CVE-2026-2603Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
- 8.1HighCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
- RHBZ#2440300 (opens in a new tab)issue-trackingx_refsource_REDHATexploit
Timeline
ID reserved
By redhat
- 30 days later
· 30 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| redhat-SADPADP (enrichment) | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
Red Hat · Red Hat build of Keycloak 26.2
- unaffected 26.2.14-1 – < *
Red Hat · Red Hat build of Keycloak 26.2
- unaffected 26.2-16 – < *
Red Hat · Red Hat build of Keycloak 26.2
- unaffected 26.2-16 – < *
Red Hat · Red Hat build of Keycloak 26.2.14
All versions: unaffected
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4.10-1 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-12 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-12 – < *
Red Hat · Red Hat build of Keycloak 26.4.10
All versions: unaffected
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.keycloak:keycloak-server-spi-privateGHSA-x4p7-7chp-64hq (opens in a new tab)
- Mavenorg.keycloak:keycloak-servicesGHSA-x4p7-7chp-64hq (opens in a new tab)
What to do
Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
References7
- RHSA-2026:3925 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:3926 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:3947 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:3948 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-2603 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2440300 (opens in a new tab)issue-trackingx_refsource_REDHATexploit
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2603.json (opens in a new tab)x_sadp-csaf-vex
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-12690 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-x4p7-7chp-64hq (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-2603)Record last updated .