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Back to active CVEs
High · CVSS 7.5CVE-2026-4525

Vault Token Leaked to Backends via Authorization: Bearer Passthrough HeaderCVE-2026-4525

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 Red Hat/mcg-cli-rhel9 (generic), Red Hat/mcg-rhel8-operator (generic), Red Hat/mcg-rhel9-operator (generic), Red Hat/odf4/mcg-cli-rhel9 (generic) and additional mapped packages. 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 Oct 25, 2026Source checked Nov 3, 2026First seen by HOL Jul 15, 2026Material review Oct 25, 2026
Upstream Advisory

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-201
Source
CVE List V5
Source checked
Nov 3, 2026
References
4 linked sources
Open source record

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
10 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 Red Hat/mcg-cli-rhel9 (generic), Red Hat/mcg-rhel8-operator (generic), Red Hat/mcg-rhel9-operator (generic), Red Hat/odf4/mcg-cli-rhel9 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:hashicorp:vault:*:*:*:*:-:*:*:*Not reportedNot reported
cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/mcg-cli-rhel9generic*Not reported
Red Hat/mcg-rhel8-operatorgeneric*Not reported
Red Hat/mcg-rhel9-operatorgeneric*Not reported
Red Hat/odf4/mcg-cli-rhel9generic*Not reported
Red Hat/odf4/mcg-rhel8-operatorgeneric*Not reported
Red Hat/odf4/mcg-rhel9-operatorgeneric*Not reported
HashiCorp/Vaultgeneric>=0.11.2 <2.0.02.0.0
HashiCorp/Vault Enterprisegeneric>=0.11.2 <2.0.02.0.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/mcg-cli-rhel9, Red Hat/mcg-rhel8-operator, Red Hat/mcg-rhel9-operator.
  2. 2Review 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

  1. Published upstream

    Apr 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 15, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencediscuss.hashicorp.com
  • Source referencesecurity.access.redhat.com
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.

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