CVE-2026-4525

Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

State: Published
Severity: 7.5 High
Published: Apr 17, 2026
Updated: Jul 15, 2026
Reserved: Mar 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	HashiCorp
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat-SADP

Weaknesses

CWE-201 Insertion of Sensitive Information Into Sent Data

Affected Products

Product	Versions
VaultHashiCorp	0.11.2 to before 2.0.0Affected
Vault EnterpriseHashiCorp	0.11.2 to before 2.0.0Affectedfrom 1.19.16Not affectedfrom 1.20.10Not affectedfrom 1.21.5Not affected

References

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