CVE-2026-126312
Received Received - Intake

ACL Bypass in OpenBao Auth Methods

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenBao before 2.6.5 and 2.7.x before 2.7.2, and the openbao-plugins LDAP and RADIUS auth plugins before 0.2.0, contain an ACL bypass in the AppRole, Cert, LDAP, and RADIUS auth methods caused by implicit path canonicalization. Authenticated attackers can request non-canonical paths for AppRole Role IDs, Cert CRLs, LDAP groups and users, or RADIUS users to evade ACL deny rules.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126312
EUVD
EUVD-2026-125208

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
openbao openbao to 2.6.5 (exc)
openbao openbao From 2.7.0 (inc) to 2.7.2 (exc)
openbao openbao-plugins to 0.2.0 (exc)
openbao openbao to 2.7.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-178 The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

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Executive Summary

This vulnerability is an ACL bypass in OpenBao versions before 2.6.5 and 2.7.2, and its LDAP and RADIUS auth plugins before 0.2.0. It occurs due to improper handling of non-canonical URL paths in AppRole, Cert Auth, LDAP, and RADIUS authentication methods. Attackers with some privileges can request non-standard paths to bypass ACL deny rules and gain unauthorized access to sensitive resources.

Detection Guidance

To detect this vulnerability, check OpenBao versions and plugins for affected releases. Use commands like 'openbao version' or 'vault version' to verify core versions. For plugins, inspect 'openbao-plugins-ldap' and 'openbao-plugins-radius' versions. Monitor logs for unusual access attempts to AppRole Role IDs, Cert CRLs, LDAP groups/users, or RADIUS users via non-canonical paths.

Impact Analysis

This vulnerability allows authenticated attackers to bypass security restrictions and access sensitive data or perform unauthorized actions. It could lead to data breaches, privilege escalation, or unauthorized modifications to system configurations. The impact includes high confidentiality and integrity risks, though availability impact is low.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, and other regulations due to unauthorized access to sensitive data. It may result in data breaches, violating confidentiality requirements and leading to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Upgrade OpenBao core to v2.6.5 or v2.7.2 and plugins to v0.2.0 or later. Apply patches immediately. Review and update ACL rules to deny non-canonical path access. Restrict authentication methods to trusted sources and audit logs for suspicious activity.

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