CVE-2026-47840 LDAP StartTLS unconditionally disables hostname verification
A network attacker can bypass TLS hostname verification in LDAP StartTLS to steal credentials and forge admin group memberships in CloudFoundry UAA deployments.
- 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-2026-47840?
CVE-2026-47840 is a high-severity vulnerability in CloudFoundry Foundation Cf-deployment, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A network attacker positioned between UAA and its LDAP directory can impersonate the directory using any certificate from any trusted CA, then harvest the LDAP bind password and every end-user password sent during simple-bind authentication, and return forged group memberships that grant themselves admin scopes. This affects every deployment that authenticates users against LDAP over StartTLS. Affected versions: UAA versions prior to v78.13.0; Cf-deployment versions prior to v56.2.0.
Which versions are affected by CVE-2026-47840?
How do I fix CVE-2026-47840?
No fix has been published for CVE-2026-47840 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-47840 being exploited?
There is no known exploitation of CVE-2026-47840 in the wild and no public exploit code.
Sources
Also known as GHSA-rh75-5vxf-83m5.