CVE-2026-40964
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Authentication Bypass in cf-auth-proxy Cloud Foundry

Publication date: 2026-06-01

Last updated on: 2026-06-01

Assigner: VMware

Description
Authentication Bypass in cf-auth-proxy in Cloud Foundry Foundation all installations allows an unauthenticated remote attacker to gain read access to every log and metric for every application and platform component via minting a JWT that the cf-auth-proxy accepts as a valid logs.admin token. Affected versions: - log-cache_release: all versions through v3.2.6 (inclusive); fixed in v3.2.7 or later - CF Deployment: all versions through v55.?.0 (inclusive); fixed in v55.?.0 or later (bundles log-cache_release v3.2.7)
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Meta Information
Published
2026-06-01
Last Modified
2026-06-01
Generated
2026-06-22
AI Q&A
2026-06-02
EPSS Evaluated
2026-06-21
NVD
CVE-2026-40964
EUVD
EUVD-2026-33765
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
cloud_foundry_foundation log_cache_release to 3.2.6 (inc)
cloud_foundry_foundation cf_deployment to 55.?.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
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Executive Summary

This vulnerability is an authentication bypass in the cf-auth-proxy component of Cloud Foundry Foundation. It allows an unauthenticated remote attacker to gain read access to all logs and metrics for every application and platform component. The attacker achieves this by minting a JSON Web Token (JWT) that the cf-auth-proxy mistakenly accepts as a valid logs.admin token.

Impact Analysis

The impact of this vulnerability is that an attacker without any authentication can read sensitive logs and metrics across all applications and platform components. This could lead to exposure of sensitive information contained in logs, potentially aiding further attacks or data leakage.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade affected components to fixed versions.

  • Upgrade log-cache_release to version 3.2.7 or later.
  • Upgrade CF Deployment to version v55.?.0 or later, which bundles log-cache_release v3.2.7.
Compliance Impact

This vulnerability allows an unauthenticated remote attacker to gain read access to every log and metric for every application and platform component by bypassing authentication in cf-auth-proxy. Such unauthorized access to sensitive logs and metrics could potentially lead to exposure of personal or sensitive data.

Unauthorized access to logs and metrics may violate data protection and privacy requirements under regulations like GDPR and HIPAA, which mandate strict controls over access to personal and sensitive information.

Therefore, this vulnerability could negatively impact compliance with these common standards and regulations by enabling unauthorized data access.

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