CVEvulnerability
CVE-2026-56398
8.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-15
- Last modified
- 2026-07-16
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.5 HIGH — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.3 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- CVSS 3.1 ([email protected])
- 9.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-20
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.
Affected configurations
• openwebui open webui (< 0.9.5)
Related
Weakness · CWE (1)
- CWE-20 Improper Input Validation weakness