SB2026043038 - Insufficiently protected credentials in Claude Code
Published: April 30, 2026
Security Bulletin ID
SB2026043038
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Insufficiently protected credentials (CVE-ID: CVE-2026-21852)
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to exposure of sensitive information in the project-load flow when processing a repository settings file before trust confirmation. A remote attacker can provide a malicious repository that sets ANTHROPIC_BASE_URL to an attacker-controlled endpoint to disclose sensitive information.
User interaction is required to start Claude Code in an attacker-controlled repository.
Remediation
Install update from vendor's website.