{"id":"CVE-2026-55770","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55770","generatedAt":"2026-10-28T01:03:47.309Z","title":"With the LDAP authentication backend configured for an Active Directory UPNDomain path or UserDN and UserAttr binding, an attacker-controlled username containing filter metacharacters could alter the search predicate and select a different directory…","description":"OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, OpenBao used EscapeLDAPValue, an RFC 4514 distinguished-name escaping function, where RFC 4515 LDAP search-filter escaping was required in sdk/helper/ldaputil/client.go GetUserDN. With the LDAP authentication backend configured for an Active Directory UPNDomain path or UserDN and UserAttr binding, an attacker-controlled username containing filter metacharacters could alter the search predicate and select a different directory entry because EscapeLDAPValue does not neutralize the characters handled by ldap.EscapeFilter. A resulting token could be associated with another LDAP identity and gain access to secrets, policies, or modification capabilities assigned to that identity. This issue is fixed in version 2.5.5.","published":"2026-09-15T16:17:16.000Z","lastModified":"2026-09-29T19:06:32.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-90"],"affected":[],"epss":{"score":0.00525,"percentile":0.44267,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.53%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3306","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3313","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.5.5","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.6.0","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55770","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}