CVE-2026-4525: Hashicorp Vault

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

If a Vault auth mount is configured to pass through the "Authorization" header, and the "Authorization" header is used to authenticate to Vault, Vault forwarded the Vault token to the auth plugin backend. Fixed in 2.0.0, 1.21.5, 1.20.10, and 1.19.16.

Affected products

• Hashicorp Vault: from 0.11.2, before 1.19.16 (fixed in 1.19.16); from 0.11.2, before 2.0.0 (fixed in 2.0.0); from 1.20.0, before 1.20.10 (fixed in 1.20.10); from 1.21.0, before 1.21.5 (fixed in 1.21.5)

Published 2026-04-17. Last modified 2026-07-15.