Low severity · published Apr 21, 2026
CVE-2026-40264
OpenBao's Token Store Allows Cross-Namespace Renewal, Revocation
2.7
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openbao · openbao
< 2.5.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40264
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40264
Vendor Advisory
https://github.com/openbao/openbao/security/advisories/GHSA-p49j-v9wc-wg57
More from openbao
9.8
CVE-2024-2048
Vault and Vault Enterprise (“Vault”) TLS certificate auth method did not correctly validate client certificates when configured with a non-CA certificate as trusted certificate
9.2
CVE-2026-63132
OpenBao's Recovery Mode Vulnerable To Token Leakage via Timing Attack
9.1
CVE-2025-54997
OpenBao: Privileged Operator May Execute Code on the Underlying Host
8.8
CVE-2024-7594
Vault’s SSH secrets engine did not require the valid_principals list to contain a value by default
8.3
CVE-2026-33757
OpenBao lacks user confirmation for OIDC direct callback mode