CVE-2026-40964Network attack vector

Log and metric disclosure via forged admin JWT

Published Jun 1, 2026 · Updated Jun 1, 2026

Authentication bypass in Cloud Foundry cf-auth-proxy allows remote attackers to read all application and platform logs and metrics. The proxy accepts an attacker-minted JWT as a valid logs.admin token, granting administrative log scope without authenticating its issuer. No credentials or user interaction are required, and the exposure spans every application and platform component while write access remains unavailable.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Cloud Foundry cf-auth-proxy allows remote attackers to read all application and platform logs and metrics. The proxy accepts an attacker-minted JWT as a valid logs.admin token, granting administrative log scope without authenticating its issuer. No credentials or user interaction are required, and the exposure spans every application and platform component while write access remains unavailable.

The record

CVE
CVE-2026-40964
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Cloud Foundry Foundation
Product
cf-deployment
Classifications
CWE-287, T1606
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=55.?.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Foundry Foundation · cf-deploymentversion=0 <=55.?.0
Cloud Foundry Foundation · Log Cache Releaseversion=0 <=3.2.6

Published CVSS scores

7.5VMwareCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1606Forge Web Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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