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CVE-2026-87853

7.5 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 18:51
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 19:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 18:51
  4. First seenCVSS 7.5NVD modified 2026-10-09 00:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3