CVE-2026-71543: Auth Bypass

Description

OpenBao is an open source identity-based secrets management system. Prior to 2.6.0, templated ACL, PKI, and SSH policies could substitute attacker-controlled identity data without rejecting syntax-significant characters. In ACL templated policies, asterisks, plus signs, and slashes could alter path matching. In PKI allowed_uri_sans_template and allowed_domains policies, an asterisk could broaden certificate issuance to unauthorized domains. In SSH allowed_users and allowed_domains policies, a comma could add unauthorized principals. Exploitation requires a deployment to use templated policy data that users can freely modify; templates based on the randomly generated identity.entity.id value are not affected. This could allow privilege escalation, unauthorized access, and unauthorized certificate issuance. This issue is fixed in version 2.6.0.

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Weakness Type (CWE)

CWE-863 Incorrect Authorization

References

Other References

https://github.com/hashicorp/vault/blob/main/CHANGELOG.md#201 https://github.com/openbao/openbao/commit/2d4ebafec5c524408b3d4ac1198df909cb7ac8c1 https://github.com/openbao/openbao/commit/e516ce508e1481504cadbfbf62052364339093bc https://github.com/openbao/openbao/pull/3401 https://github.com/openbao/openbao/pull/3473 https://github.com/openbao/openbao/releases/tag/v2.6.0 https://github.com/openbao/openbao/security/advisories/GHSA-59w7-v8rr-pr4p

Frequently Asked Questions

What is CVE-2026-71543? +

OpenBao is an open source identity-based secrets management system. Prior to 2.6.0, templated ACL, PKI, and SSH policies could substitute attacker-controlled identity data without rejecting syntax-significant characters. In ACL templated policies, asterisks, plus signs, and slashes could alter path matching. In PKI allowed_uri_sans_template and allowed_domains policies, an asterisk could broaden certificate issuance to unauthorized domains. In SSH allowed_users and allowed_domains policies, a comma could add unauthorized principals. Exploitation requires a deployment to use templated policy data that users can freely modify; templates based on the randomly generated identity.entity.id value are not affected. This could allow privilege escalation, unauthorized access, and unauthorized certificate issuance. This issue is fixed in version 2.6.0.

How do I check if I'm vulnerable to CVE-2026-71543? +

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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