CVE-2026-45386: Open WebUI has an IDOR vulnerability in the pin_channel_message API endpoint

May 14, 2026 (updated May 15, 2026)

Pin/Unpin is a write operation (modifies the message’s is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message.

References

github.com/advisories/GHSA-5gc6-xhv4-2wg6
github.com/open-webui/open-webui/releases/tag/v0.9.5
github.com/open-webui/open-webui/security/advisories/GHSA-5gc6-xhv4-2wg6
nvd.nist.gov/vuln/detail/CVE-2026-45386

Code Behaviors & Features

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