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sssd

A vulnerability in SSSD's IdP authentication provider allows an attacker to authenticate as another user if the attacker's IdP identifier is a strict prefix of the target user's identifier. This is due to a prefix comparison flaw in the eval_access_token_buf() function that uses strncmp() incorrectly. The issue affects multiple specific versions of SSSD. The CVSS score is 7.5, indicating a medium severity level.

CVE-2026-87853 is a vulnerability in the System Security Services Daemon (SSSD) IdP authentication provider. The flaw arises because the eval_access_token_buf() function compares the OpenID Connect (OIDC) subject identifier using strncmp() with the length of the authenticated user's identifier, resulting in a prefix comparison rather than an exact match. Consequently, an attacker whose IdP identifier is a strict prefix of a legitimate user's identifier can bypass authentication and impersonate that user. This affects numerous specific versions of SSSD as listed. The vulnerability has a CVSS 3.1 base score of 7.5, with network attack vector, high impact on confidentiality, integrity, and availability, and requires low privileges and high attack complexity.

A vulnerability in SSSD's IdP authentication provider allows an attacker to authenticate as another user if the attacker's IdP identifier is a strict prefix of the target user's identifier. This is due to a prefix comparison flaw in the eval_access_token_buf() function that uses strncmp() incorrectl

A flaw was found in SSSD's IdP authentication provider. (CVE-2026-87853)

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