What’s Vulnerable › Vulnerabilities

CVE-2025-55000: OpenBao TOTP Secrets Engine Enables Code Reuse

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-09 · updated 2026-06-17
• Weakness: CWE-156

Description

OpenBao exists to provide a software solution to manage, store, and distribute sensitive data including secrets, certificates, and keys. In versions 0.1.0 through 2.3.1, OpenBao's TOTP secrets engine could accept valid codes multiple times rather than strictly-once. This was caused by unexpected normalization in the underlying TOTP library. To work around, ensure that all codes are first normalized before submitting to the OpenBao endpoint. TOTP code verification is a privileged action; only trusted systems should be verifying codes.

Affected products

• openbao: before 2.3.2 — fixed in 2.3.2

How to fix

Upgrade to a fixed version: openbao 2.3.2. Check the vendor advisory for mitigations.

References

• https://discuss.hashicorp.com/t/hcsec-2025-17-vault-totp-secrets-engine-code-reuse/76036
• https://github.com/openbao/openbao/commit/183891f8d535d5b6eb3d79fda8200cade6de99e1
• https://github.com/openbao/openbao/security/advisories/GHSA-f7c3-mhj2-9pvg

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