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

Quick assessment

Affected
HashiCorp Vault
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HashiCorp Vault是美国HashiCorp公司的一款私钥访问管理工具。 HashiCorp Vault 2.0.0之前版本、1.21.5之前版本、1.20.10之前版本和1.19.16之前版本存在安全漏洞，该漏洞源于Vault将令牌转发到身份验证插件后端。

CVSS 7.5 · High EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials

Affected Version Matrix 2

VendorProduct Version RangeStatus
HashiCorp Vault 0.11.2< 2.0.0 affected
HashiCorp Vault Enterprise 0.11.2< 2.0.0 affected
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I. Basic Information for CVE-2026-4525

Vulnerability Information
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Vulnerability Title
Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
HashiCorp Vault 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HashiCorp Vault是美国HashiCorp公司的一款私钥访问管理工具。 HashiCorp Vault 2.0.0之前版本、1.21.5之前版本、1.20.10之前版本和1.19.16之前版本存在安全漏洞，该漏洞源于Vault将令牌转发到身份验证插件后端。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Vault 0.11.2 ~ 2.0.0 -
HashiCorp Vault Enterprise 0.11.2 ~ 2.0.0 -

II. Public POCs for CVE-2026-4525

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III. Intelligence Information for CVE-2026-4525

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Other References for CVE-2026-4525 (1)

Same Patch Batch · HashiCorp · 2026-04-17 · 4 CVEs total

CVE-2026-3605 8.1 HIGH Vault KVv2 Metadata and Secret Deletion Policy Bypass Denial-of-Service
CVE-2026-5807 7.5 HIGH Vault Vulnerable to Denial-of-Service via Unauthenticated Root Token Generation/Rekey Oper
CVE-2026-5052 5.3 MEDIUM Vault Vulnerable to Server-Side Request Forgery in ACME Challenge Validation via Attacker-

IV. Related Vulnerabilities

Same product: Vault
Same vendor: HashiCorp
Same weakness: CWE-201

V. Comments for CVE-2026-4525

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