XSS in Open-Webui
CVE-2026-45314
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the channel webhook create/update flow accepts arbitrary profile_image_url values, including data:image/svg+xml;base64,... payloads. The profile image endpoint then decodes and serves this SVG as image/svg+xml without sanitization, allowing attacker-controlled script handlers (for example onload) to execute when the profile-image URL is opened in the browser. This vulnerability is fixed in 0.9.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.2% 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: 0.002 · change: +0.000
Affected products
- Open-Webui — versions < 0.9.3
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-3856-3vxq-m6fc (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45314?
- CVE-2026-45314 is a medium-severity vulnerability in Open-Webui, classified under Improper Neutralization of Alternate XSS Syntax. CVSS score: 6.1/10. Published 2026-05-15.
- How severe is CVE-2026-45314?
- Medium severity. CVSS v3 base score is 6.1 out of 10.