Delegated-admin client-secret disclosure via masked-sentinel reuse
Published Jul 17, 2026 · Updated Jul 17, 2026
Improper input validation in Red Hat build of Keycloak allows remote authenticated users to disclose an OIDC IdP client secret. IdentityProviderResource.updateIdpFromRep() replaces a masked clientSecret sentinel with the stored secret without rejecting simultaneous changes to tokenUrl, clientId, or clientAuthMethod. A delegated identity-provider manager with manage-identity-providers permission can redirect normal broker traffic to an attacker-controlled token endpoint and capture that secret.
Summary
What happened
Improper input validation in Red Hat build of Keycloak allows remote authenticated users to disclose an OIDC IdP client secret. IdentityProviderResource.updateIdpFromRep() replaces a masked clientSecret sentinel with the stored secret without rejecting simultaneous changes to tokenUrl, clientId, or clientAuthMethod. A delegated identity-provider manager with manage-identity-providers permission can redirect normal broker traffic to an attacker-controlled token endpoint and capture that secret.
The record
- CVE
- CVE-2026-15943
- Published
- Jul 17, 2026
- Updated
- Jul 17, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat build of Keycloak
- Classifications
- CWE-1288, T1555
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 17, 2026CVE publishedPublication date reported by the CVE source.
- Jul 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
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Your stack
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