CVE-2026-4525
Received Received - Intake
Authorization Header Token Disclosure in HashiCorp Vault Auth Mount

Publication date: 2026-04-17

Last updated on: 2026-04-27

Assigner: HashiCorp Inc.

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.
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Meta Information
Published
2026-04-17
Last Modified
2026-04-27
Generated
2026-06-16
AI Q&A
2026-04-17
EPSS Evaluated
2026-06-14
NVD
CVE-2026-4525
EUVD
EUVD-2026-23345
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
hashicorp vault From 1.20.0 (inc) to 1.20.10 (exc)
hashicorp vault From 1.21.0 (inc) to 1.21.5 (exc)
hashicorp vault From 0.11.2 (inc) to 2.0.0 (exc)
hashicorp vault From 0.11.2 (inc) to 1.19.16 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-201 The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
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Executive Summary

This vulnerability occurs when a Vault authentication mount is configured to pass through the "Authorization" header, and that header is used to authenticate to Vault. In this case, Vault mistakenly forwards the Vault token contained in the "Authorization" header to the authentication plugin backend.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of Vault tokens because the tokens are forwarded to the authentication plugin backend. This could allow attackers or unauthorized parties to gain access to sensitive Vault tokens, potentially compromising confidentiality, integrity, and availability of secrets managed by Vault.

Mitigation Strategies

To mitigate this vulnerability, upgrade Vault to one of the fixed versions: 2.0.0, 1.21.5, 1.20.10, or 1.19.16.

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