# CVE-2026-55770

## Summary

- **CVE ID:** CVE-2026-55770
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-90
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## 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.

## Affected Products

- openbao — openbao (< 2.5.5)

## References

- [CNA](https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9)
- [CNA](https://github.com/openbao/openbao/pull/3306)
- [CNA](https://github.com/openbao/openbao/pull/3313)
- [CNA](https://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659)
- [CNA](https://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c)
- [CNA](https://github.com/openbao/openbao/releases/tag/v2.5.5)
- [CNA](https://github.com/openbao/openbao/releases/tag/v2.6.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.45%
- **EPSS Percentile:** 38.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._