| Component | Open WebUI |
| Severity | high (CVSS 7.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
| Published (NVD) | 2026-07-15 |
| Last modified | 2026-07-16 |
| Affected versions | open_webui < 0.9.5 |
| Fixed in | 0.9.5 |
| Weakness | CWE-20 |
| CISA KEV | not listed |
NVD description
Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture claim URL MIME type is inferred from file extension rather than Content-Type header, allowing SVG files to bypass the profile image validator and be stored as data URIs. Authenticated users who visit the profile image endpoint receive attacker-controlled SVG content with inline disposition and no default security headers, enabling script execution in the same origin to steal authentication tokens and achieve account takeover.
What to do
- Upgrade Open WebUI to
0.9.5or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56398
- https://github.com/open-webui/open-webui/security/advisories/GHSA-3wgj-c2hg-vm6q
- https://www.vulncheck.com/advisories/open-webui-stored-cross-site-scripting-via-oauth-picture-claim-svg-data-uri
Read more
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