OpenBao CVE-2026-40264

EUVD-2026-24037 LOW

Improper Restriction of Security Token Assignment (CWE-1259)

2026-04-21 GitHub_M

GHSA-p49j-v9wc-wg57

Information Disclosure

2.0

CVSS 4.0

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Scope

Lifecycle Timeline

Patch available

Apr 21, 2026 - 02:01 EUVD

Analysis Generated

Apr 21, 2026 - 01:24 vuln.today

CVSS changed

Apr 21, 2026 - 01:22 NVD

2.0 (LOW)

DescriptionNVD

OpenBao is an open source identity-based secrets management system. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged administrator in another tenant. This is addressed in v2.5.3.

AnalysisAI

OpenBao versions prior to 2.5.3 allow high-privileged administrators in one tenant to revoke or renew authentication tokens belonging to users in other tenants if the token accessor is disclosed, bypassing the multi-tenant isolation guarantee. The vulnerability requires high privilege level and user interaction but undermines the core security boundary of OpenBao's namespace-based multi-tenancy model. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-40264 vulnerability details – vuln.today

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