CVE-2026-47840 — LDAP StartTLS unconditionally disables hostname verification
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Cloud Foundry Foundation Cf-deployment, Cloud Foundry Foundation UAA).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Cloud Foundry Foundation | Cf-deployment | < 56.2.0 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Cloud Foundry Foundation | UAA | < 78.13.0 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 9.3 | CVSS 4.0 | Critical | — | — | security@vmware.com via NIST National Vulnerability Database |
| 8.3 | CVSS 4.0 | High | — | — | vmware via CVE Program (cve.org) e CISA ADP |
| 7.5 | CVSS 3.1 | High | 2.2 | 4.7 | security@vmware.com via NIST National Vulnerability Database |
| 7.5 | CVSS 3.1 | High | — | — | vmware via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N (score shown at the top: security@vmware.com) Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · cloudfoundry foundation/uaa, cloudfoundry foundation/cf-deployment
- SSVC assessment updated
- Record published
- CVSS changed · 7.5
- Source status changed · → Awaiting Analysis
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-59358 UAA OAuth Token Endpoint Vulnerability allows user access token reuse for client_credentials grant type 9d
- Medium CVE-2026-59357 Self-UAA OIDC Configuration allows JWT injection to establish unauthorized sessions 9d
- Critical CVE-2026-41005 UAA accepts SAML Encrypted Assertions authentication bypass Jun 11, 2026
- High CVE-2026-40964 Improper Authentication in Cloud Foundry Foundation Log-cache Release Jun 1, 2026
- Critical CVE-2026-40965 Exposure of Sensitive Information in Cloud Foundry Foundation Uaa-release Jun 1, 2026
- High CVE-2026-41013 Tenant-controlled comma smuggles arbitrary CIFS mount options Jun 1, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CWE classification.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-47840 is "LDAP StartTLS unconditionally disables hostname verification", rated High. It affects Cf-deployment (Cloud Foundry Foundation); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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