Reliance on Untrusted Inputs in a Security Decision in Claude Code - CVE-2026-33068
Published: April 30, 2026
Vulnerability identifier: #VU128510
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-33068
CWE-ID: CWE-807
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Claude Code
Claude Code
Software vendor:
Anthropic
Anthropic
Description
The vulnerability allows a remote attacker to gain tool execution without explicit user consent.
The vulnerability exists due to reliance on untrusted inputs in a security decision in the workspace trust dialog logic when processing the repo-controlled .claude/settings.json file on first open. A remote attacker can commit a malicious settings file that sets permissions.defaultMode to bypassPermissions to gain tool execution without explicit user consent.
User interaction is required when the victim first opens a malicious repository.
Remediation
Install security update from vendor's website.