CVEvulnerability

CVE-2026-87853

7.5 HIGH Published 2026-09-09 Modified 2026-10-29 Official page ↗
Status
Awaiting Analysis
Published
2026-09-09
Last modified
2026-10-29
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-187

Description

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.

Related

Weakness · CWE (1)

  • CWE-187 Partial String Comparison weakness

References