{"id":"CVE-2025-55001","aliases":["GHSA-2q8q-8fgw-9p6p","BIT-openbao-2025-55001","GO-2025-3859"],"title":"OpenBao LDAP MFA Enforcement Bypass When Using Username As Alias","summary":"OpenBao LDAP MFA Enforcement Bypass When Using Username As Alias","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","vendor":"openbao","product":"github.com/openbao/openbao","ecosystem":"go","affected":["github.com/openbao/openbao >= 0.1.0, < 2.3.2","github.com/openbao/openbao < 0.0.0-20250807212521-c52795c1ef74"],"patched":["github.com/openbao/openbao 2.3.2","github.com/openbao/openbao 0.0.0-20250807212521-c52795c1ef74"],"published":"2025-08-08","updated":"2026-07-27","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-2q8q-8fgw-9p6p","references":[{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-2q8q-8fgw-9p6p"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55001"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6013"},{"url":"https://github.com/openbao/openbao/commit/c52795c1ef746c7f2c510f9225aa8ccbbd44f9fc"},{"url":"https://discuss.hashicorp.com/t/hcsec-2025-20-vault-ldap-mfa-enforcement-bypass-when-using-username-as-alias/76092"},{"url":"https://github.com/openbao/openbao"}],"tags":["osv","go"],"epss":0.00221,"epssPercentile":0.11256,"ingestedAt":"2026-07-27T19:08:54.090Z","slug":"CVE-2025-55001","body":"## Overview\n\n### Impact\n\nOpenBao allows assignment of policies and MFA attribution based upon entity aliases, chosen by the underlying auth method. When using the `username_as_alias=true` parameter in the LDAP auth method, the caller-supplied username is used verbatim without normalization, allowing an attacker to bypass alias-specific MFA requirements.\n\n### Patches\n\nOpenBao v2.3.2 will patch this issue.\n\n### Workarounds\n\nLDAP methods are only vulnerable if using `username_as_alias=true`. Remove all usage of this parameter and update any entity aliases accordingly.\n\n### References\n\nThis issue was disclosed to HashiCorp and is the OpenBao equivalent of the following tickets:\n\n- https://discuss.hashicorp.com/t/hcsec-2025-20-vault-ldap-mfa-enforcement-bypass-when-using-username-as-alias/76092\n- https://nvd.nist.gov/vuln/detail/CVE-2025-6013\n\n## Affected packages\n\n- `github.com/openbao/openbao >= 0.1.0, < 2.3.2`\n- `github.com/openbao/openbao < 0.0.0-20250807212521-c52795c1ef74`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/openbao/openbao 2.3.2`\n- `github.com/openbao/openbao 0.0.0-20250807212521-c52795c1ef74`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}