CVE-2026-87853 SSSD - Authentication Bypass

SSSD contains an authentication bypass caused by prefix comparison of OIDC subject identifiers in eval_access_token_buf(), letting attackers authenticate as other users with prefix IdP identifiers, exploit requires attacker to control IdP identifier.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-187

Vendor fix

Update to the latest version with fixed exact matching of OIDC subject identifiers.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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