CVE-2026-4525: Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

Published Apr 17, 2026
·
Updated

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 Software

6 affected components
HashiCorp Vault<2.0.0, <1.21.5, <1.20.10, <1.19.16
go/github.com/hashicorp/vault>=0.11.2<=1.21.4
HashiCorp Vault>=0.11.2<1.19.16
HashiCorp Vault>=0.11.2<2.0.0
HashiCorp Vault>=1.20.0<1.20.10
HashiCorp Vault>=1.21.0<1.21.5

Event History

Apr 17, 2026
CVE Published
via MITRE·03:00 AM
Data Sourced
via MITRE·03:00 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·04:16 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·04:16 AM
Affected Software
Advisory Published
via GitHub·06:31 AM
Data Sourced
via GitHub·06:31 AM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-4525?

The severity of CVE-2026-4525 is categorized as high due to the potential exposure of sensitive tokens.

2

How do I fix CVE-2026-4525?

To fix CVE-2026-4525, upgrade HashiCorp Vault to version 2.0.0 or 1.21.5 and above.

3

What are the affected versions in CVE-2026-4525?

CVE-2026-4525 affects HashiCorp Vault versions below 2.0.0 and 1.21.5, including 1.20.10 and earlier.

4

What does CVE-2026-4525 exploit?

CVE-2026-4525 exploits the passthrough of the 'Authorization' header, which can lead to Vault tokens being exposed.

5

Is there a workaround for CVE-2026-4525?

Currently, there is no recommended workaround for CVE-2026-4525; upgrading to a fixed version is advised.

Company

Resources

Contact

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