CVE-2026-4525

HIGH EPSS 22.6%

Published Apr 17, 20262mo ago · Modified Jun 17, 20261w ago

8.8 CVSS 3.1

High

Published Apr 17, 2026 2mo ago

Last Modified Jun 17, 2026 1w ago

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 Details

Base Score

8.8

Exploitability

2.8

Impact

5.9

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality High

Integrity High

Availability High

Threat Intelligence

EPSS Exploit Probability

22.6% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-201

Affected Products 4

Vendor	Product	Version	Range
hashicorp	vault	*	≥0.11.2 – <1.19.16
hashicorp	vault	*	≥0.11.2 – <2.0.0
hashicorp	vault	*	≥1.20.0 – <1.20.10
hashicorp	vault	*	≥1.21.0 – <1.21.5

References 1

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

Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.