EUVD-2026-45164
GHSA-rpfh-mgxm-c6hc
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
PR:H reflects mandatory delegated admin access; C:H captures full client secret exfiltration; I:L reflects token URL tampering; AV:N because exploitation occurs via the web-based admin interface.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Keycloak's identity provider management component exposes OIDC client secrets to delegated administrators who manipulate the masked sentinel value mechanism during IdP updates. When a delegated admin submits a configuration update using the sentinel placeholder for the client secret while simultaneously changing the token URL to an attacker-controlled endpoint, Keycloak improperly reuses the real underlying secret without validating the consistency of the changed security-sensitive field. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a Keycloak delegated administrator role with permissions to update identity provider configurations - specifically the 'manage-identity-providers' permission or equivalent delegation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 with vector AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N reflects a moderate overall risk significantly constrained by the PR:H prerequisite - exploitation is limited to actors who already hold delegated administrator privileges within Keycloak. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who holds or has compromised a delegated administrator account in Keycloak navigates to an existing OIDC identity provider configuration and changes the token endpoint URL to an attacker-controlled server while submitting the masked sentinel placeholder in the client_secret field. Keycloak, failing to detect the inconsistency between the sentinel and the changed token URL, saves the configuration with the real client secret intact. … |
| Remediation | Apply the vendor-supplied patch through the Red Hat Customer Portal advisory at https://access.redhat.com/security/cve/CVE-2026-15943; an exact fixed version is not independently confirmed from the available data, so consult that page and the associated Bugzilla ticket at https://bugzilla.redhat.com/show_bug.cgi?id=2501270 for the precise target version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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