ThinkInAIXYZ deepchat up to 1.0.3 AI Endpoint preload/index.ts api.openExternal input validation

Summaryinfo

A vulnerability labeled as critical has been found in ThinkInAIXYZ deepchat up to 1.0.3. Affected by this issue is the function api.openExternal of the file preload/index.ts of the component AI Endpoint. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-43899. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ThinkInAIXYZ deepchat up to 1.0.3. Affected by this issue is the function api.openExternal of the file preload/index.ts of the component AI Endpoint. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, An incomplete mitigation for CVE-2025-55733 leaves DeepChat vulnerable to an arbitrary protocol execution bypass (RCE). While the patch correctly restricted api.openExternal() inside the renderer's preload/index.ts script, it structurally neglected to sanitize native Electron pop-up window handlers. An attacker or a compromised AI endpoint returning a Markdown link can trigger a target="_blank" native window interception in tabPresenter.ts, which forwards the malicious URL directly to shell.openExternal(url) and completely bypasses the isValidExternalUrl security boundary. This vulnerability is fixed in v1.0.4-beta.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-43899 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. There are known technical details, but no exploit is available.

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

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Productinfo

Type

• Chat Software

Vendor

• ThinkInAIXYZ

Name

• deepchat

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

Website

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

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