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CVE-2026-45808— OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL

Quick assessment

Affected
openbao openbao
Exploitation
Public or AI PoC available; prioritize validation
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组织开源的一款提供加密与身份权限管理功能的软件。 OpenBao 2.5.4之前版本存在授权问题漏洞，该漏洞源于命名空间隔离问题，可能导致其他租户用户通过旧端点sys/revoke和sys/renew撤销或续订租约及底层凭据。

CVSS 7.1 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
openbao openbao < 2.5.4 affected
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I. Basic Information for CVE-2026-45808

Vulnerability Information
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Vulnerability Title
OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.4, OpenBao's namespaces provide multi-tenant separation. A tenant who intentionally leaks lease identifiers can have their lease and underlying credential revoked or renewed by a user in another tenant via the legacy, undocumented `sys/revoke` and `sys/renew` endpoints. This is fixed in OpenBao v2.5.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenBao 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBao是OpenBao组织开源的一款提供加密与身份权限管理功能的软件。 OpenBao 2.5.4之前版本存在授权问题漏洞，该漏洞源于命名空间隔离问题，可能导致其他租户用户通过旧端点sys/revoke和sys/renew撤销或续订租约及底层凭据。
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

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.4 -

II. Public POCs for CVE-2026-45808

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 5783 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-45808

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Patches & Fixes for CVE-2026-45808 (2)

Vendor Advisories for CVE-2026-45808 (1)

Vendor Pages for CVE-2026-45808 (1)

Same Patch Batch · openbao · 2026-08-07 · 3 CVEs total

CVE-2026-46358 5.4 MEDIUM OpenBao's Inline Auth Incorrectly Redacted Headers
CVE-2026-46405 5.3 MEDIUM OpenBao's Kerberos Auth Method Accumulates Unaccessible Tokens

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-863

V. Comments for CVE-2026-45808

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