CVE-2026-47840

LDAP StartTLS unconditionally disables hostname verification

High · published July 9, 2026

CVSS v4.0
8.3
EPSS
0%
Percentile
11.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.3 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00217 · 11.5th percentile
Published
2026-07-09T06:26Z
EPSS history
Timeline
  • 09 JUL 06:26Z
    LDAP StartTLS unconditionally disables hostname verification
    cvelistv5