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CVE-2026-4525

Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

Published: Apr 17, 2026Updated: Apr 27, 2026 Sources: CVE List NVD BDUCWE-201
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 77.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-201

Affected Products

VaultHashiCorp
SaaSSaaS Service
Cloud & SaaS
Vault EnterpriseHashiCorp
SaaSSaaS Service
Cloud & SaaS
vaulthashicorp
SaaSSaaS Service
Cloud & SaaS
Vault Community EditionHashiCorp
On-prem
Cloud & SaaS / api-gateway
hashicorpcommercialUSCloud & SaaSaka hashicorp inc.

Exploitability

Official Patch Available

References

https://discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorrect-header-sanitization/77344
discuss.hashicorp.com

Timeline

Published
Apr 17, 2026
Last Updated
Apr 27, 2026

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