LDAP StartTLS unconditionally disables hostname verification
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| CloudFoundry Foundation | UAA | before 78.13.0 | 78.13.0 | Patch available | CNA |
| CloudFoundry Foundation | Cf-deployment | before 56.2.0 | 56.2.0 | Patch available | CNA |
- UAA VendorCloudFoundry Foundation Affected before 78.13.0 Fixed in 78.13.0 Patch available CNA
- Cf-deployment VendorCloudFoundry Foundation Affected before 56.2.0 Fixed in 56.2.0 Patch available CNA
Remediation
- Fix · CNA UAA (CloudFoundry Foundation) Fixed in 78.13.0
- Fix · CNA Cf-deployment (CloudFoundry Foundation) Fixed in 56.2.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-47840
- 2026-10-03 Alias added: GHSA-rh75-5vxf-83m5
References
More CloudFoundry Foundation vulnerabilities
- TI-2018-15273 Path traversal in code.cloudfoundry.org/archiver CVSS 3.1CRITICAL 9.1
- TI-2016-05702 Command injection in Cloud Foundry CVSS 3.0CRITICAL 9.8
- TI-2022-13629 Improper certificate validation in Cloud Foundry Diego and CF Deployment CVSS 3.1CRITICAL 9.1
- TI-2016-06771 Improper input validation in Cloud Foundry CVSS 3.0CRITICAL 9.8
- TI-2016-00680 Cloud Foundry Garden-Linux versions prior to v0.333.0 and Elastic Runtime 1.6.x version… CVSS 3.1CRITICAL 9.8
- TI-2017-03116 Improper privilege management in Cloud Foundry CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-47840 · CVE Program
- CVE-2026-47840 · NVD
- FIRST EPSS
- GHSA-rh75-5vxf-83m5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences