OpenBao's Token Store Allows Cross-Namespace Renewal, Revocation (CVE-2026-40264)
Description
OpenBao is an open source identity-based secrets management system that uses namespaces for multi-tenant separation. Prior to version 2.5.3, a vulnerability allowed a privileged administrator in one tenant to renew or revoke tokens belonging to another tenant if token accessors were leaked. This cross-namespace token renewal and revocation issue is fixed in version 2.5.3.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
OpenBao versions before 2.5.3 contain a vulnerability (CVE-2026-40264) where the multi-tenant namespace separation is bypassed for token renewal and revocation operations. Specifically, if a token accessor is leaked, a privileged administrator from a different tenant can revoke or renew that token, potentially impacting token lifecycle management across tenants. This issue is resolved in OpenBao version 2.5.3.
Potential Impact
The vulnerability allows privileged administrators in one tenant to interfere with tokens in another tenant by renewing or revoking them if token accessors are leaked. This could lead to unauthorized token lifecycle actions across tenant boundaries, potentially disrupting authentication or access for affected tenants. The severity is assessed as low.
Mitigation Recommendations
Upgrade OpenBao to version 2.5.3 or later, where this cross-namespace token renewal and revocation vulnerability is fixed. No other mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-openbao-2026-40264
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-40264"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Low
Threat ID: 6aa005f4acd9273b49ab638d
Added to database: 09/08/2026, 12:56:20 UTC
Last enriched: 09/08/2026, 13:31:14 UTC
Last updated: 10/21/2026, 13:20:21 UTC
Views: 20
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