SB2026043030 - Reliance on Untrusted Inputs in a Security Decision in Claude Code

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026043030

SB2026043030 - Reliance on Untrusted Inputs in a Security Decision in Claude Code

Published: April 30, 2026

Security Bulletin ID SB2026043030
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Reliance on Untrusted Inputs in a Security Decision (CVE-ID: CVE-2026-33068)

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 update from vendor's website.

References