CVE-2026-4525: CWE-201: Insertion of Sensitive Information Into Sent Data in HashiCorp Vault
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-4525) involves the insertion of sensitive information into sent data within HashiCorp Vault. Specifically, when a Vault authentication mount passes through the "Authorization" header and that header is used for authentication, Vault forwards the Vault token to the authentication plugin backend, potentially exposing sensitive tokens. The vulnerability is classified under CWE-201 (Insertion of Sensitive Information Into Sent Data). It affects versions prior to 2.0.0, 1.21.5, 1.20.10, and 1.19.16, where the issue has been fixed.
Potential Impact
The vulnerability can lead to unauthorized disclosure of Vault tokens by forwarding them to the auth plugin backend, which may increase the risk of token compromise and unauthorized access. The CVSS score is 7.5 (High), indicating a significant impact on confidentiality, integrity, and availability if exploited.
Mitigation Recommendations
Fixed versions are available: 2.0.0, 1.21.5, 1.20.10, and 1.19.16. Users should upgrade to one of these versions to remediate the vulnerability. Patch status is confirmed by the vendor advisory. No additional mitigations are specified.
CVE-2026-4525: CWE-201: Insertion of Sensitive Information Into Sent Data in HashiCorp Vault
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 v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-4525) involves the insertion of sensitive information into sent data within HashiCorp Vault. Specifically, when a Vault authentication mount passes through the "Authorization" header and that header is used for authentication, Vault forwards the Vault token to the authentication plugin backend, potentially exposing sensitive tokens. The vulnerability is classified under CWE-201 (Insertion of Sensitive Information Into Sent Data). It affects versions prior to 2.0.0, 1.21.5, 1.20.10, and 1.19.16, where the issue has been fixed.
Potential Impact
The vulnerability can lead to unauthorized disclosure of Vault tokens by forwarding them to the auth plugin backend, which may increase the risk of token compromise and unauthorized access. The CVSS score is 7.5 (High), indicating a significant impact on confidentiality, integrity, and availability if exploited.
Mitigation Recommendations
Fixed versions are available: 2.0.0, 1.21.5, 1.20.10, and 1.19.16. Users should upgrade to one of these versions to remediate the vulnerability. Patch status is confirmed by the vendor advisory. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- HashiCorp
- Date Reserved
- 2026-03-20T17:47:40.835Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-4525","vendor":"Red Hat"}]
Threat ID: 69e2142082d89c981fcd7c24
Added to database: 04/17/2026, 11:06:08 UTC
Last enriched: 07/15/2026, 09:26:04 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 138
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