# CVE-2026-40964: Auth bypass in CF Deployment

> Unauthenticated attackers can mint JWTs to bypass authentication and read all application and platform logs and metrics in Cloud Foundry.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2026
- **Updated:** 11 Jun 2026
- **Also known as:** GHSA-9cjf-w9mw-93r3

## What is CVE-2026-40964?

CVE-2026-40964 is a high-severity authentication bypass vulnerability in Cloud Foundry Foundation CF Deployment, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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)

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-40964?


## How do I fix CVE-2026-40964?

No fix has been published for CVE-2026-40964 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40964 being exploited?

There is no known exploitation of CVE-2026-40964 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40964 and fix it if it is affected.

What it is: CVE-2026-40964 is a high-severity authentication bypass vulnerability in Cloud Foundry Foundation CF Deployment, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-40964 in the wild and no public exploit code.

Affected product: Cloud Foundry Foundation CF Deployment. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-40964/ (Markdown: https://insights.sbomify.com/CVE-2026-40964/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40964
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40964
- OSV: https://osv.dev/vulnerability/CVE-2026-40964

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40964/
Summaries are generated and may contain mistakes; the official description above is the record.