Medium severity · published May 15, 2026
CVE-2026-45386
Open WebUI: An IDOR vulnerability exists in the pin_channel_message API endpoint
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
< 0.9.5 · source: vendor
OW
Open Webui · Openwebui
before 0.9.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45386
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-5gc6-xhv4-2wg6
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