{"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":0.00203,"epssPercentile":0.10574,"ingestedAt":"2026-07-27T19:08:55.129Z","slug":"CVE-2025-55003","body":"## Overview\n\n### Impact\n\nOpenBao'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.\n\n### Patches\n\nOpenBao v2.3.2 will patch this issue.\n\n### Workarounds\n\nUse of rate-limiting quotas can limit an attacker's ability to exploit this: https://openbao.org/api-docs/system/rate-limit-quotas/\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-2025-19-vault-login-mfa-bypass-of-rate-limiting-and-totp-token-reuse/76038\n- https://nvd.nist.gov/vuln/detail/CVE-2025-6015\n\n## Affected packages\n\n- `github.com/openbao/openbao >= 0.1.0, < 2.3.2`\n- `github.com/openbao/openbao < 0.0.0-20250807113757-8340a6918f6c`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/openbao/openbao 2.3.2`\n- `github.com/openbao/openbao 0.0.0-20250807113757-8340a6918f6c`","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":31.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}