Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-4525US | high8.8 | — | ||
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… | ||||
02
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-4525WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2459107WEB
- https://discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorrect-header-sanitization/77344ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-4525WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4525.jsonWEB
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