CVE-2026-4525: Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header
High · CVSS 7.5 (CVSS 3.1)EPSS 0.41%, 35th percentilePublished Updated Assigner: HashiCorp
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.
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H · CWE-201
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
HashiCorp: VaultHashiCorp: Vault EnterpriseRed Hat: Red Hat OpenShift Container Platform 4Red Hat: Red Hat Openshift Data Foundation 4
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorr… (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)