{"id":"CVE-2026-47840","state":"PUBLISHED","title":"LDAP StartTLS unconditionally disables hostname verification","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.\nAffected versions: UAA versions prior to v78.13.0; Cf-deployment versions prior to v56.2.0.","publishedAt":"2026-07-09T06:26:02.169Z","updatedAt":"2026-07-09T12:49:24.260Z","severity":{"score":8.3,"label":"High","version":"4.0","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","source":"vmware"},"assigner":"vmware","products":["CloudFoundry Foundation UAA","CloudFoundry Foundation Cf-deployment"],"affected":[{"vendor":"CloudFoundry Foundation","product":"UAA","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"78.13.0","versionType":"custom"}]},{"vendor":"CloudFoundry Foundation","product":"Cf-deployment","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"56.2.0","versionType":"custom"}]}],"references":["https://www.cloudfoundry.org/blog/cve-2026-47840-ldap-starttls-unconditionally-disables-hostname-verification/"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/47xxx/CVE-2026-47840.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47840","state":"PUBLISHED","datePublished":"2026-07-09T06:26:02.169Z","dateUpdated":"2026-07-09T12:49:24.260Z","assignerShortName":"vmware","assignerOrgId":"dcf2e128-44bd-42ed-91e8-88f912c1401d","dateReserved":"2026-05-20T10:00:51.003Z"},"containers":{"cna":{"title":"LDAP StartTLS unconditionally disables hostname verification","descriptions":[{"lang":"en","value":"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.\nAffected versions: UAA versions prior to v78.13.0; Cf-deployment versions prior to v56.2.0."}],"affected":[{"vendor":"CloudFoundry Foundation","product":"UAA","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"78.13.0","versionType":"custom"}]},{"vendor":"CloudFoundry Foundation","product":"Cf-deployment","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"56.2.0","versionType":"custom"}]}],"references":[{"url":"https://www.cloudfoundry.org/blog/cve-2026-47840-ldap-starttls-unconditionally-disables-hostname-verification/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"HIGH","availabilityImpact":"NONE"},"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.3,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-297 Improper Validation of Certificate with Host Mismatch","type":"CWE"}]}],"providerMetadata":{"shortName":"vmware","orgId":"dcf2e128-44bd-42ed-91e8-88f912c1401d","dateUpdated":"2026-07-09T06:26:02.169Z"},"impacts":[{"descriptions":[{"lang":"en","value":"LDAP directory impersonation via man-in-the-middle, leading to credential harvesting and forged group memberships granting admin scopes."}]}],"source":{"discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T12:49:05.698046Z","id":"CVE-2026-47840","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T12:49:24.260Z"}}]}}}