---
id: CVE-2025-55003
aliases:
  - GHSA-rxp7-9q75-vj3p
  - BIT-openbao-2025-55003
  - GO-2025-3856
title: OpenBao Login MFA Bypass of Rate Limiting and TOTP Token Reuse
summary: OpenBao Login MFA Bypass of Rate Limiting and TOTP Token Reuse
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/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 < 0.0.0-20250807113757-8340a6918f6c
patched:
  - github.com/openbao/openbao 2.3.2
  - github.com/openbao/openbao 0.0.0-20250807113757-8340a6918f6c
published: '2025-08-08'
updated: '2026-07-27'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-rxp7-9q75-vj3p'
references:
  - url: 'https://github.com/openbao/openbao/security/advisories/GHSA-rxp7-9q75-vj3p'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-55003'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-6015'
  - url: >-
      https://github.com/openbao/openbao/commit/8340a6918f6c41d8f75b6c3845c376d9dc32ed19
  - url: >-
      https://discuss.hashicorp.com/t/hcsec-2025-19-vault-login-mfa-bypass-of-rate-limiting-and-totp-token-reuse/76038
  - url: 'https://github.com/openbao/openbao'
tags:
  - osv
  - go
epss: 0.00243
epssPercentile: 0.13707
ingestedAt: '2026-07-27T19:08:55.129Z'
---

## Overview

### Impact

OpenBao's Login Multi-Factor Authentication (MFA) system allows enforcing MFA using Time-based One Time Password (TOTP). Due to normalization applied by the underlying TOTP library, codes were accepted which could contain whitespace; this whitespace could bypass internal rate limiting of the MFA method and allow reuse of existing MFA codes.

### Patches

OpenBao v2.3.2 will patch this issue.

### Workarounds

Use of rate-limiting quotas can limit an attacker's ability to exploit this: https://openbao.org/api-docs/system/rate-limit-quotas/

### References

This issue was disclosed to HashiCorp and is the OpenBao equivalent of the following tickets:

- https://discuss.hashicorp.com/t/hcsec-2025-19-vault-login-mfa-bypass-of-rate-limiting-and-totp-token-reuse/76038
- https://nvd.nist.gov/vuln/detail/CVE-2025-6015

## Affected packages

- `github.com/openbao/openbao >= 0.1.0, < 2.3.2`
- `github.com/openbao/openbao < 0.0.0-20250807113757-8340a6918f6c`

## Remediation

Upgrade to a patched release:

- `github.com/openbao/openbao 2.3.2`
- `github.com/openbao/openbao 0.0.0-20250807113757-8340a6918f6c`