EUVD-2026-23345
GHSA-72gw-fmmr-c4r4
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires non-default header pass-through config plus attacker-controlled plugin backend (AC:H) and a valid in-flight token (PR:L); primary impact is token disclosure (C:H) with downstream replay (I:L), no availability impact.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
13DescriptionNVD
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.
AnalysisAI
Token leakage in HashiCorp Vault and Vault Enterprise (0.11.2 up to 2.0.0, 1.21.5, 1.20.10, and 1.19.16) occurs when an auth mount is configured to pass through the 'Authorization' header and that same header is used to authenticate to Vault; in this case Vault forwards the caller's Vault token onward to the auth plugin backend. An authenticated client's token is thereby exposed to a plugin backend that should never see it, enabling potential impersonation and unauthorized secret access. No public exploit identified at time of analysis, and EPSS exploitation probability is negligible (0.01%, 3rd percentile).
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