open-webui Open WebUI up to 0.9.4 Profile Image Validator cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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3.4$0-$5k0.29

Summaryinfo

A vulnerability was found in open-webui Open WebUI up to 0.9.4 and classified as problematic. This affects an unknown function of the component Profile Image Validator. Executing a manipulation can lead to cross site scripting. This vulnerability is tracked as CVE-2026-56398. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in open-webui Open WebUI up to 0.9.4. It has been declared as problematic. This vulnerability affects an unknown code of the component Profile Image Validator. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-56398 since 06/21/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 0.9.5 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Open WebUI 0.9.5

Timelineinfo

06/21/2026 CVE reserved
07/15/2026 +24 days Advisory disclosed
07/15/2026 +0 days VulDB entry created
07/15/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-56398 (🔒)
GCVE (CVE): GCVE-0-2026-56398
GCVE (VulDB): GCVE-100-379222

Entryinfo

Created: 07/15/2026 14:26
Changes: 07/15/2026 14:26 (53)
Complete: 🔍
Cache ID: 216::103

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