A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.
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No solution given by the vendor.
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References
History
Tue, 18 Aug 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:/a:redhat:build_keycloak:26.6::el9 | |
| References |
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Tue, 18 Aug 2026 20:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim. | |
| Title | Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
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| Weaknesses | CWE-341 | |
| CPEs | cpe:/a:redhat:build_keycloak:26.6 cpe:/a:redhat:jboss_data_grid:8 cpe:/a:redhat:jbosseapxp cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
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| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-08-18T20:45:34.499Z
Reserved: 2026-07-13T07:12:45.061Z
Link: CVE-2026-15571
No data.
Status : Received
Published: 2026-08-18T21:16:33.910
Modified: 2026-08-18T21:16:33.910
Link: CVE-2026-15571
No data.
OpenCVE Enrichment
Updated: 2026-08-18T21:15:03Z
Weaknesses