Medium severity · published May 15, 2026
CVE-2026-45351
Open WebUI: Exposure of System Prompt to Regular User [Non-Admin]
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.9, when a regular user [non-admin] logs into the application, a http://IP:8080/api/models? web request is initiated by the application and in response, it reveals the system prompt of available models set by admin on models pages in workspace affecting the confidentiality of application. This vulnerability is fixed in 0.8.9.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
< 0.8.9 · source: vendor
OW
Open Webui · Openwebui
before 0.8.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45351
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45351
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-jh9g-8jqw-m2qx
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