Severity:

CRITICAL RISK

(9.1)

Covert WebFetch Data Exfiltration (CWE-200) in Claude Code

CVE-2026-54316

Published:

Jun 23, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-284

HIGH RISK

HIGH

(8.1)

Improper Access Control (CWE-284) in Keycloak JWT Grants

Unauthorized Access and Privilege Misuse

July 15, 2026

CWE-287;CWE-290

CRITICAL RISK

CRITICAL

(9.8)

Header Login Bypass (CWE-287) in Wekan Kanban Auth

Full Account Takeover and Privilege Escalation

July 15, 2026

Vulnerability Type

Category:

Covert Data Exfiltration via Trusted Endpoint Abuse

CWE:

CWE-183;CWE-200;CWE-515

Impact:

Sensitive Data Exfiltration and Policy Bypass

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Covert Data Exfiltration via Trusted Endpoint Abuse

CWE:

CWE-183;CWE-200;CWE-515

Impact:

Sensitive Data Exfiltration and Policy Bypass

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Defensive + offensive security.

From first line of code to a pentest that knows every line of it.

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Defensive + offensive security.

From first line of code to a pentest that knows every line of it.

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Covert WebFetch Data Exfiltration (CWE-200) in Claude Code

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.1)

Improper Access Control (CWE-284) in Keycloak JWT Grants

CRITICAL RISK

CRITICAL

(9.8)

Header Login Bypass (CWE-287) in Wekan Kanban Auth

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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