Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header (CVE-2026-4525) | HOL Guard CVE

High · CVSS 7.5CVE-2026-4525

Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

Answer in brief

CVE-2026-4525 records a High severity (CVSS 7.5) vulnerability in Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header. The current sources do not mark it as known exploited. The current feed maps HashiCorp/Vault (generic), HashiCorp/Vault Enterprise (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 17, 2026Updated Jul 15, 2026Source checked Sep 19, 2026First seen by HOL Jul 15, 2026Material review Jul 15, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HashiCorp/Vault (generic), HashiCorp/Vault Enterprise (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
HashiCorp/Vaultgeneric	>=0.11.2 <2.0.0	2.0.0
HashiCorp/Vault Enterprisegeneric	>=0.11.2 <2.0.0	2.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for HashiCorp/Vault, HashiCorp/Vault Enterprise.
Review the reported fix. Update HashiCorp/Vault to 2.0.0; HashiCorp/Vault Enterprise to 2.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Apr 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.