Auth bypass in Open-Webui
CVE-2026-45316
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.6% 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: +0.000
Affected products
- Open-Webui — versions < 0.9.3
- Openwebui Open Webui
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/open-webui/open-webui/security/advisories/GHSA-jx2x-j75f-xq3j (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45316?
- CVE-2026-45316 is a low-severity vulnerability in Open-Webui, classified under Incorrect Authorization. CVSS score: 3.5/10. Published 2026-05-15.
- How severe is CVE-2026-45316?
- Low severity. CVSS v3 base score is 3.5 out of 10.
- Is CVE-2026-45316 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.