CVE-2026-45675HIGH 8.1EPSS p27.1%

CVE-2026-45675CVE-2026-45675

openwebui / open_webui

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py, line 663) was explicitly patched to prevent this race with the comment "Insert with default role first to avoid TOCTOU race", but the LDAP and OAuth code paths were never updated with the same fix. This vulnerability is fixed in 0.9.0.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.35% probability of exploitation · percentile 27.1% · 2026-06-18T12:00:27Z
Published2026-05-15
Last modified2026-06-18

Underlying weaknesses· 2

CWE-269CWE-362

References

  1. https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ec
  2. https://github.com/open-webui/open-webui/pull/23626
  3. https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3

2

TypeTargetConfidenceTier
WeaknessImproper Privilege Managementcwe-2690%live
WeaknessConcurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')cwe-3620%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.