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Wednesday, 28 October 2026
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Incident database

DeepChat CVE-2026-43899: external URL handler bypass enables code execution

DeepChat versions before v1.0.4-beta.1 contained an incomplete fix for CVE-2025-55733, allowing an arbitrary protocol execution bypass (RCE). A Markdown link with target="_blank" returned by an attacker or compromised AI endpoint was passed by the native Electron pop-up handler in tabPresenter.ts straight to shell.openExternal(), bypassing the isValidExternalUrl check.

Disclosed 11 May 2026 · Record updated 1 October 2026

Impact

Malicious or compromised AI endpoints could trigger arbitrary protocol execution (remote code execution) on users' machines by returning a crafted Markdown link.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-43899