Bug 2459107 (CVE-2026-4525)

Summary: CVE-2026-4525 Vault: Vault: Information disclosure of authentication tokens via incorrect header handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: manissin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Vault. When a Vault authentication mount is configured to pass through the "Authorization" header, and this header is used for authentication, Vault incorrectly forwards the sensitive Vault token to the authentication plugin backend. This can lead to the disclosure of authentication tokens to potentially untrusted or compromised backend plugins, enabling unauthorized access or further system compromise.
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Description OSIDB Bzimport 2026-04-17 04:01:48 UTC 
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.