CVE-2026-88005CWE-863broken-access-control

CVE-2026-88005

Medium · published September 10, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
29.9
In the wild
Unconfirmed
What it is

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00371 · 29.9th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-09-10T19:17Z
Affected products (1)
ProductVersionsFixed in
openwebui/open_webui≥ 0.8.0, < 0.9.00.9.0
References (3)
https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca · [email protected]https://github.com/open-webui/open-webui/pull/23639 · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927 · [email protected]
EPSS history
Timeline
  • 12 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 10 SEP 14:38Z
    Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange
    cvelistv5