CVE-2026-87853

Publié : 9 septembre 2026

Modifié : 9 septembre 2026

Score CVSS

7.5

HIGH

Description détaillée

A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.

Vecteur d'attaque (CVSS)

Vecteur brut :CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Références et Patchs

https://access.redhat.com/security/cve/CVE-2026-87853 https://bugzilla.redhat.com/show_bug.cgi?id=2530888

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