CVE-2026-109296: Open WebUI before 0.11.4 contains a missing authorization vulnerability that allows authenticated users to rea

Routine

MEDIUM 4.3

CVE-2026-109296 is a medium-severity flaw (CVSS 4.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-639, CWE-862
Published	2026-10-12
Last modified	2026-10-23

Publisher (CNA): VulnCheck

Timeline

2026-10-12 17:17 UTCPublished CVE record published
2026-10-23 22:16 UTCUpdated Record last modified

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References

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