CVE-2026-4525highCWE-201

CVE-2026-4525: high-severity vulnerability in HashiCorp Vault

Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
HashiCorp · VaultHashiCorp · Vault Enterprise
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