CVE-2026-109296CWE-639CWE-862broken-access-control

CVE-2026-109296

Medium · published October 12, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
18.9
In the wild
Unconfirmed
What it is

Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to reach disabled model provider backends by supplying an explicit backend index. Attackers can pass the index as a path segment or query parameter on Ollama and OpenAI-compatible listing routes to trigger requests carrying configured API keys, read version strings, and enumerate connections.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00275 · 18.9th percentile
Weaknesses
CWE-639 · Authorization Bypass Through User-Controlled Key; CWE-862 · Missing Authorization
Published
2026-10-12T21:17Z
References (2)
https://github.com/open-webui/open-webui/security/advisories/GHSA-hm62-64q2-6gxw · [email protected]https://www.vulncheck.com/advisories/open-webui-before-0.11.4-missing-authorization-via-backend-index-on-model-routes · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
    cvelistv5