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CVE-2026-4525

Vault Token Leaked to Backends via Authorization: Bearer Passthrough Header

HIGH
8.8
CVSS Score
Published: April 17, 2026 at 03:00 AM UTC
Updated: October 25, 2026 at 11:10 PM UTC
2 products affected across 2 vendorsVaultOpenShift Data Foundation

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vault· Hashicorp
95%
All versions0.11.2 ≤ v < 1.19.160.11.2 ≤ v < 2.0.01.20.0 ≤ v < 1.20.101.21.0 ≤ v < 1.21.50.11.2
Affected range stops below 1.19.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.20.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.21.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement
OpenShift Data Foundation· Red Hatcontainer
60%
4
Vendor states this is fixed in 4 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Vendor Advisory
Source: cverecord
https://discuss.hashicorp.com/t/hcsec-2026-07-vault-may-expose-tokens-to-auth-plugins-due-to-incorrect-header-sanitization/77344
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/security/cve/CVE-2026-4525
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://bugzilla.redhat.com/show_bug.cgi?id=2459107
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4525.json

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-201

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