PT-2026-60119 · Openwebui · Open-Webui

Matte1782 · Published 2026-07-15 · Updated 2026-07-15 · CVE-2026-56398

NVD

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-56398

Affected Products

Open-Webui

References · 3

• https://github.com/open-webui/open-webui/security/advisories/GHSA-3wgj-c2hg-vm6q · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56398 · Security Note
• https://vulncheck.com/advisories/open-webui-stored-cross-site-scripting-via-oauth-picture-claim-svg-data-uri · Note