OpenBao lacks user confirmation for OIDC direct callback mode

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Summary

CVECVE-2026-33757
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 15:16:57 UTC
Updated2026-03-30 17:23:24 UTC
DescriptionOpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao does not prompt for user confirmation when logging in via JWT/OIDC and a role with `callback_mode` set to `direct`. This allows an attacker to start an authentication request and perform "remote phishing" by having the victim visit the URL and automatically log-in to the session of the attacker. Despite being based on the authorization code flow, the `direct` mode calls back directly to the API and allows an attacker to poll for an OpenBao token until it is issued. Version 2.5.2 includes an additional confirmation screen for `direct` type logins that requires manual user interaction in order to finish the authentication. This issue can be worked around either by removing any roles with `callback_mode=direct` or enforcing confirmation for every session on the token issuer side for the Client ID used by OpenBao.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

EPSS: 0.000630000 probability, percentile 0.196880000 (date 2026-04-01)

Problem Types: CWE-384 | CWE-384 CWE-384: Session Fixation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openbao Openbao All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openbao Openbao affected < 2.5.2 Not specified

References

ReferenceSourceLinkTags
datatracker.ietf.org/doc/html/rfc8628 [email protected] datatracker.ietf.org Technical Description
github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964 [email protected] github.com Patch
github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3 [email protected] github.com Vendor Advisory
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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