ThinkInAIXYZ deepchat up to 1.0.4-beta.0 SVG Artifact svgSanitizer.ts SVGSanitizer cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in ThinkInAIXYZ deepchat up to 1.0.4-beta.0. The impacted element is the function SVGSanitizer in the library src/main/lib/svgSanitizer.ts of the component SVG Artifact Handler. Such manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-43900. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ThinkInAIXYZ deepchat up to 1.0.4-beta.0. It has been rated as problematic. Affected by this issue is the function SVGSanitizer in the library src/main/lib/svgSanitizer.ts of the component SVG Artifact Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer and the frontend browser rendering engine. The SVGSanitizer (src/main/lib/svgSanitizer.ts) restricts script execution by scrubbing javascript: protocols using plain-text regular expressions. However, it fails to account for HTML entity decoding prior to Vue's v-html DOM insertion inside the SvgArtifact.vue component. By feeding an SVG artifact with obfuscated entities (e.g., javascript:alert(1)), an attacker can completely bypass the sanitizer, culminating in arbitrary JavaScript execution when a victim interacts with the rendered SVG Element. This vulnerability is fixed in v1.0.4-beta.1.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-43900 since 05/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 1.0.4-beta.1 eliminates this vulnerability.

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Productinfo

Type

• Chat Software

Vendor

• ThinkInAIXYZ

Name

• deepchat

Version

• 1.0.4-beta

Website

• Product: https://github.com/ThinkInAIXYZ/deepchat/

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