CVE-2026-45345: Open WebUI missing authorization check at the model update function - models from other users can be updated

May 14, 2026 (updated May 19, 2026)

A user can modify another user’s model even if its visibility is set to Private. The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.

References

github.com/advisories/GHSA-gm54-m39w-grjp
github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp
nvd.nist.gov/vuln/detail/CVE-2026-45345

Code Behaviors & Features

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