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A timing side channel in Vault and Vault Enterprise’s (“Vault”) userpass auth method allowed an attacker to distinguish between existing and non-existing users, and potentially enumerate valid usernames for Vault’s Userpass auth method. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23.
Reserved 2025-06-11 | Published 2025-08-01 | Updated 2025-08-01 | Assigner HashiCorpCWE-203: Observable Discrepancy
discuss.hashicorp.com/...-vault-s-userpass-auth-method/76034
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