CVE-2026-15943 — MEDIUM (5.5)

Vulnerability Description

A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-

Related Weaknesses (CWE)

CWE-1288

References

https://access.redhat.com/security/cve/CVE-2026-15943Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2501270Issue TrackingVendor Advisory

FAQ

What is CVE-2026-15943?

CVE-2026-15943 is a vulnerability with a CVSS score of 5.5 (MEDIUM). A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider usin...

How severe is CVE-2026-15943?

CVE-2026-15943 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-15943?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.