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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Claude Code flaws: Windows config hijack and symlink sandbox escape

Two vulnerabilities were disclosed in Anthropic's agentic coding tool Claude Code: CVE-2026-35603, where Windows versions before 2.1.75 loaded a system-wide settings file from a world-writable ProgramData path letting a low-privileged local user plant malicious configuration, and CVE-2026-39861, where versions before 2.1.64 allowed a sandbox escape via symlinks that the unsandboxed process followed to write outside the workspace, triggerable through prompt injection. Both issues were fixed in the noted releases.

Disclosed 17 April 2026 · Record updated 13 September 2026

Impact

A local low-privileged user could force malicious configuration onto other users of a shared Windows machine, and untrusted content in the context window could be used to escape the sandbox and write to arbitrary locations, potentially leading to code execution outside the sandbox. No exploitation in the wild is reported.

Our coverage

No articles linked to this incident yet.

Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-35603
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-39861