CVE-2026-87853

highEPSS 0.003 · 24 %ileDEUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.33% (24th) EPSS
CVSS 7.5 · high
Is it mine?
4 products
Check your exposure
Who says so?
1 sources
cert_bund

EPSS · scored 2026-10-19

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · secalert@redhat.com USexploitability 1.6 · impact 5.9
v3.16.9mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-187US
04

affected products (4)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-3848Red Hat Enterprise Linux (sssd, tftp, ansible-collection-ansible-posix): Mehrere SchwachstellenDeutsch2026-10-08csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen und einen Denial-of-Service-Zustand auszulösen.

06

sources

Which sources assert this record, and when.

cert_bundNVDCVE.orgMITRE
published 2026-09-09modified 2026-10-09
07

references (3) nvd

External citations — patches, advisories, analysis.

scry

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