CVE-2026-18967Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow
Updated under an hour ago ()
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It affects Red Hat Build of Keycloak and 4 other products. 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 the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.
- CVSS
- 6.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-294
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Analyzed
- Record last updated
- Aug 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Build of Keycloak redhat:build_keycloak | All versions | CNA record |
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp | All versions | CNA record |
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CNA record |
redhat build_of_keycloak redhat:build_of_keycloak | all versions | NVD |
redhat jboss_enterprise_application_platform_expansion_pack redhat:jboss_enterprise_application_platform_expansion_pack | all versions | NVD |
References
- https://access.redhat.com/security/cve/CVE-2026-18967vdb-entry, x-refsource-redhat, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2511604issue-tracking, x-refsource-redhat, permissions-required
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.