CVE-2026-56398
Open WebUI - Stored Cross-Site Scripting via OAuth Picture Claim SVG Data URI
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-20 |
| Vendor | open-webui |
| Product | open-webui |
| Published | Jul 15, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
open-webui / open-webui
0 < 0.9.5
References
Credits
🔍 matte1782