CVE-2026-55774: Auth Bypass

Description

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation. The affected lease lookup routing in vault/expiration.go allowed FetchLeaseInfo and loadEntry to resolve cached or stored lease data outside the request namespace, allowing a tenant that intentionally disclosed a lease identifier to have the lease and its underlying credential revoked by another tenant. This issue is fixed in version 2.5.5.

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Weakness Type (CWE)

CWE-863 Incorrect Authorization

References

Other References

https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540 https://github.com/openbao/openbao/commit/b20b999dd4044d7b419a5472d8fe08407828be37 https://github.com/openbao/openbao/pull/3307 https://github.com/openbao/openbao/pull/3310 https://github.com/openbao/openbao/releases/tag/v2.5.5 https://github.com/openbao/openbao/releases/tag/v2.6.0 https://github.com/openbao/openbao/security/advisories/GHSA-c36x-h252-g9x2

Frequently Asked Questions

What is CVE-2026-55774? +

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation. The affected lease lookup routing in vault/expiration.go allowed FetchLeaseInfo and loadEntry to resolve cached or stored lease data outside the request namespace, allowing a tenant that intentionally disclosed a lease identifier to have the lease and its underlying credential revoked by another tenant. This issue is fixed in version 2.5.5.

How do I check if I'm vulnerable to CVE-2026-55774? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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