Is CVE-2026-35603 actively exploited?

No active exploitation of CVE-2026-35603 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-35603 be exploited remotely?

No. CVE-2026-35603 requires local access to exploit.

What is the CVSS score of CVE-2026-35603?

CVE-2026-35603 has a CVSS score of 7.3 (HIGH).

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HIGH

CVE-2026-35603

CWE-426Published: April 17, 2026· Updated: Apr 22, 2026

7.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.6th

Official Description

Claude Code is an agentic coding tool. In versions prior to 2.1.75 on Windows, Claude Code loaded the system-wide default configuration from C:\ProgramData\ClaudeCode\managed-settings.json without validating directory ownership or access permissions. Because the ProgramData directory is writable by non-administrative users by default and the ClaudeCode subdirectory was not pre-created or access-restricted, a low-privileged local user could create this directory and place a malicious configuration file that would be automatically loaded for any user launching Claude Code on the same machine. Exploiting this would have required a shared multi-user Windows system and a victim user to launch Claude Code after the malicious configuration was placed. This issue has been fixed on version 2.1.75.

NVD Source

Technical Analysis

CVE-2026-35603 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.3.