Information disclosure in Open-Webui
CVE-2026-45387
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Open-Webui — versions < 0.9.5
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-h2cw-7qw9-56xr (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45387?
- CVE-2026-45387 is a medium-severity vulnerability in Open-Webui, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-05-15.
- How severe is CVE-2026-45387?
- Medium severity. CVSS v3 base score is 4.3 out of 10.