Anthropic claude-code up to 2.1.83 claude/settings.json command injection

Summaryinfo

A vulnerability has been found in Anthropic claude-code up to 2.1.83 and classified as critical. This affects an unknown function of the file claude/settings.json. The manipulation leads to command injection. This vulnerability is traded as CVE-2026-40068. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Anthropic claude-code up to 2.1.83. It has been rated as critical. This issue affects an unknown part of the file claude/settings.json. The manipulation with an unknown input leads to a command injection vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In versions 2.1.63 through 2.1.83 of Claude Code, the folder trust determination logic used the git worktree commondir file without validating its contents. An attacker could craft a malicious repository with a commondir file pointing to a path the victim had previously trusted, causing Claude Code to bypass its trust confirmation dialog and immediately execute hooks defined in `.claude/settings.json`. Exploitation requires the victim to clone the malicious repository and run Claude Code within it, and the attacker must know or guess a path the victim had already trusted. This issue has been fixed in version 2.1.84.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-40068 since 04/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

By approaching the search of inurl:claude/settings.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.1.84 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-27502). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• Anthropic

Name

• claude-code

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19
• 2.1.20
• 2.1.21
• 2.1.22
• 2.1.23
• 2.1.24
• 2.1.25
• 2.1.26
• 2.1.27
• 2.1.28
• 2.1.29
• 2.1.30
• 2.1.31
• 2.1.32
• 2.1.33
• 2.1.34
• 2.1.35
• 2.1.36
• 2.1.37
• 2.1.38
• 2.1.39
• 2.1.40
• 2.1.41
• 2.1.42
• 2.1.43
• 2.1.44
• 2.1.45
• 2.1.46
• 2.1.47
• 2.1.48
• 2.1.49
• 2.1.50
• 2.1.51
• 2.1.52
• 2.1.53
• 2.1.54
• 2.1.55
• 2.1.56
• 2.1.57
• 2.1.58
• 2.1.59
• 2.1.60
• 2.1.61
• 2.1.62
• 2.1.63
• 2.1.64
• 2.1.65
• 2.1.66
• 2.1.67
• 2.1.68
• 2.1.69
• 2.1.70
• 2.1.71
• 2.1.72
• 2.1.73
• 2.1.74
• 2.1.75
• 2.1.76
• 2.1.77
• 2.1.78
• 2.1.79
• 2.1.80
• 2.1.81
• 2.1.82
• 2.1.83

CPE 2.3info

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CPE 2.2info

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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