Vulnerability · Published May 15, 2026 · Assigned by GitHub_M

CVE-2026-45386Open WebUI: An IDOR vulnerability exists in the pin_channel_message API endpoint

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, 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. This vulnerability is fixed in 0.9.5.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.9.5	GHSA-5gc6-xhv4-2wg6
PyPI	open-webui	0.9.5	PYSEC-2026-2705

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.9.5

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-5gc6-xhv4-2wg6 x_refsource_CONFIRM