CVE-2026-40264— OpenBao's Token Store Allows Cross-Namespace Renewal, Revocation
Quick assessment
Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.5.3之前版本存在安全漏洞，该漏洞源于命名空间多租户分离问题，可能导致泄露令牌访问器的租户被其他租户的特权管理员撤销或续订令牌。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-40264
Vulnerability Information
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Vulnerability Title
OpenBao's Token Store Allows Cross-Namespace Renewal, Revocation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1259
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBao是OpenBao开源的一个敏感数据管理软件。 OpenBao 2.5.3之前版本存在安全漏洞，该漏洞源于命名空间多租户分离问题，可能导致泄露令牌访问器的租户被其他租户的特权管理员撤销或续订令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-40264
| # | POC Description | Source Link | Shenlong Link |
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Same Patch Batch · openbao · 2026-04-21 · 4 CVEs total
| CVE-2026-39396 | 3.1 LOW | OpenBao has Decompression Bomb via Unbounded Copy in OCI Plugin Extraction (DoS) |
| CVE-2026-39388 | OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate | |
| CVE-2026-39946 | OpenBao allows SQL Injection in PostgreSQL database secrets engine |
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CVE-2026-63132
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Same vendor: openbao
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CVE-2026-71543
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Same weakness: CWE-1259
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V. Comments for CVE-2026-40264
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