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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-40964 being exploited?
There is no known exploitation of CVE-2026-40964 in the wild and no public exploit code.
Sources
Also known as GHSA-9cjf-w9mw-93r3.