CVE-2026-4525

high

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4525.json

https://discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorrect-header-sanitization/77344

https://bugzilla.redhat.com/show_bug.cgi?id=2459107

https://access.redhat.com/security/cve/CVE-2026-4525

Details

Source: Mitre, NVD

Published: 2026-04-17

Updated: 2026-07-15

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00015