GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

FKIE_CVE-2026-55770

Vulnerability from fkie_nvd - Published: 2026-09-15 16:17 - Updated: 2026-09-15 17:17
Severity
6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/openbao/openbao/commit/10b7825c714c1ef25b6c3c1c2cd6ecd8747c0659
security-advisories@github.comhttps://github.com/openbao/openbao/commit/8077f96bdc02137b0a072146b6f9ca11c96c549c
security-advisories@github.comhttps://github.com/openbao/openbao/pull/3306
security-advisories@github.comhttps://github.com/openbao/openbao/pull/3313
security-advisories@github.comhttps://github.com/openbao/openbao/releases/tag/v2.5.5
security-advisories@github.comhttps://github.com/openbao/openbao/releases/tag/v2.6.0
security-advisories@github.comhttps://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "openbao",
          "vendor": "openbao",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.5.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-55770",
  "lastModified": "2026-09-15T17:17:22.473",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55770",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-15T16:40:19.438513Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-15T16:17:15.763",
  "references": [
    {
      "source": "security-advisories@github.com",
      "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/openbao/openbao/security/advisories/GHSA-6mwx-4547-5vc9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-90"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.