Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header
Summary
| CVE | CVE-2026-4525 |
|---|---|
| State | PUBLISHED |
| Assigner | HashiCorp |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-17 04:16:09 UTC |
| Updated | 2026-06-30 03:20:34 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.8 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000150000 probability, percentile 0.030500000 (date 2026-04-21)
Problem Types: CWE-201 | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data | CWE-201 Insertion of Sensitive Information Into Sent Data
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | HashiCorp | Vault | affected 0.11.2 2.0.0 semver | 64 bit, 32 bit, x86, ARM, MacOS, Windows, Linux |
| CNA | HashiCorp | Vault Enterprise | affected 0.11.2 2.0.0 semver | 64 bit, 32 bit, x86, ARM, MacOS, Windows, Linux |
| ADP | Red Hat | Red Hat Openshift Data Foundation 4 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4525.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-t... | [email protected] | discuss.hashicorp.com | Vendor Advisory |
| access.redhat.com/security/cve/CVE-2026-4525 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: This issue was identified and reported by Oleh Konko of 1seal. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-17T04:01:24.934Z | Reported to Red Hat. |
| ADP | 2026-04-17T03:00:47.561Z | Made public. |
Workarounds
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
There are currently no legacy QID mappings associated with this CVE.