CVE-2026-15571 — Keycloak-services: keycloak-services: predictable account-linking hash enables account takeover via malicious oidc client
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 pr…
Published: 2026-08-18 · CVSS: 7.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7