Anthropic claude-code up to 2.0.64 insufficiently protected credentials

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Anthropic claude-code up to 2.0.64. It has been classified as problematic. The affected element is an unknown function. Performing a manipulation results in insufficiently protected credentials. This vulnerability is cataloged as CVE-2026-21852. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Anthropic claude-code up to 2.0.64. It has been classified as problematic. This affects an unknown code block. The manipulation with an unknown input leads to a insufficiently protected credentials vulnerability. CWE is classifying the issue as CWE-522. The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. This is going to have an impact on confidentiality. The summary by CVE is:

Claude Code is an agentic coding tool. Prior to version 2.0.65, vulnerability in Claude Code's project-load flow allowed malicious repositories to exfiltrate data including Anthropic API keys before users confirmed trust. An attacker-controlled repository could include a settings file that sets ANTHROPIC_BASE_URL to an attacker-controlled endpoint and when the repository was opened, Claude Code would read the configuration and immediately issue API requests before showing the trust prompt, potentially leaking the user's API keys. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to version 2.0.65, which contains a patch, or to the latest version.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-21852 since 01/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1552 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 305985 (Anthropic Claude Code < 2.0.65 API Key Leak via Project Settings (CVE-2026-21852)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.0.65 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (305985) and EUVD (EUVD-2026-3597). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Insufficiently protected credentials
CWE: CWE-522
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305985
Nessus Name: Anthropic Claude Code < 2.0.65 API Key Leak via Project Settings (CVE-2026-21852)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: claude-code 2.0.65

Timelineinfo

01/05/2026 CVE reserved
01/21/2026 +16 days VulDB entry created
01/22/2026 +0 days Advisory disclosed
04/11/2026 +79 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-jh7p-qr78-84p7
Status: Confirmed

CVE: CVE-2026-21852 (🔒)
GCVE (CVE): GCVE-0-2026-21852
GCVE (VulDB): GCVE-100-342249
EUVD: 🔒

Entryinfo

Created: 01/22/2026 00:53
Updated: 04/11/2026 11:15
Changes: 01/22/2026 00:53 (66), 01/22/2026 07:38 (1), 02/03/2026 06:12 (11), 03/17/2026 16:50 (2), 04/11/2026 11:15 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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