Medium severity · published May 15, 2026
CVE-2026-45387
Open WebUI: Sharing models for others to use (read permission) also exposes model details (system prompt leakage)
4.3
CVSS
0.2%
EPSS
No
On KEV
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, when setting model permissions so that a group has read access to it, intending for other users to use it, those users also can read the model's system prompt. However users may consider their system prompt confidential, so this is considered a security issue. This vulnerability is fixed in 0.9.5.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% 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-2026-45387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45387
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-h2cw-7qw9-56xr
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