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Advisories

Open WebUI - Stored Cross-Site Scripting via OAuth Picture Claim SVG Data URI

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severity
high
date
Affecting

  • open-webui >= 0, < 0.9.5

CWE
  • CWE-20 Improper Input Validation
CVSS
8.5
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
matte1782
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.

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