OpenBao LDAP MFA Enforcement Bypass When Using Username As Alias
OpenBao 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.
OpenBao v2.3.2 will patch this issue.
LDAP methods are only vulnerable if using username_as_alias=true. Remove all usage of this parameter and update any entity aliases accordingly.
This issue was disclosed to HashiCorp and is the OpenBao equivalent of the following tickets:
This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CVE-2025-55001 is classified as CWE-156: Improper Neutralization of Whitespace. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as whitespace when they are sent to a downstream component.
CVE-2025-55001 is recorded against 2 packages.
Published on 8 August 2025 and last revised on 27 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.
github.com (Web)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)
github.com (Web)
discuss.hashicorp.com (Web)
github.com (Package)
github.com/openbao/openbao has other advisories on record. If you are patching this one, these are worth checking on the same host:
These advisories are the same class of weakness (CWE-156: Improper Neutralization of Whitespace) in other software:
Details
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| github.com/openbao/openbao | — | — |
| openbao | — | — |
References
Similar Threats
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