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CVE-2026-56398— Open WebUI - Stored Cross-Site Scripting via OAuth Picture Claim SVG Data URI

CVSS 7.3 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProductVersion RangeStatus
open-webuiopen-webui< 0.9.5affected
0.9.5unaffected
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I. Basic Information for CVE-2026-56398

Vulnerability Information
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Vulnerability Title
Open WebUI - Stored Cross-Site Scripting via OAuth Picture Claim SVG Data URI
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
open-webui 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
open-webui open-webui是open-webui的机器学习领域中用于人工智能相关应用的用户界面。 open-webui 0.9.5之前版本存在输入验证错误漏洞，该漏洞源于OAuth身份验证流程中通过对图片声明URL MIME类型从文件扩展名而非Content-Type标头进行推断，导致SVG文件绕过配置文件图像验证器并存储为数据URI，经过身份验证的用户访问配置文件图像端点时会收到攻击者控制的SVG内容，可能导致脚本在同一源中执行以窃取身份验证令牌并实现账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
open-webuiopen-webui 0 ~ 0.9.5 -

II. Public POCs for CVE-2026-56398

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 8013 chars
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III. Intelligence Information for CVE-2026-56398

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Vendor Advisories for CVE-2026-56398 (2)

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-20

V. Comments for CVE-2026-56398

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