Summary
OpenBao's Templated Policies Allow Privilege Escalation via Wildcard Characters
ACL Policies
OpenBao supports "templated polices": Policies with placeholders that are replaced at evaluation time.
This allows you to write a single policy which e.g. grants user "alice" access to all entries in a key value engine prefixed with alice/ while granting "bob" access to bob/, "carol" access to carol/, etc.
If the data used in the template can be controlled by an attacker (e.g. your system allows the user to freely select their username) and "globbing" characters are considered valid ( e.g. * is a valid username) they will be able to escalate their privileges.
The problematic characters are *, + and /.
PKI Secrets Engine allowed_uri_sans_template and allowed_domains Polices
The PKI secrets engine allows you to limit the "common names" a user can requests a TLS certificate for. Similar to the ACL polices this allows you to restrict e.g. "alice" to alice.example.com, "bob" to bob.example.com, etc. via templates.
Again, if an attacker can control this data freely, they can trick the PKI engine into using e.g. the *.example.com glob effectively allowing them to issue certificates for any subdomain of example.com
The problematic character in this case is *.
SSH Secrets Engine allowed_users and allowed_domains Polices
The SSH secrets engine allows you to limit the "principal" a user can request as SSH certificate for. Similar to ACL and PKI, this allows templates.
The problematic character in this case is , as the template result is split at all commas and each entry will be allowed.
Am I affected?
You are affected, if a) you use a templated policy (ACL, PKI or SSH) and b) your users can modify data used by your template freely.
If you can guarantee that the data used in your templates will never contain the problematic characters, you are not affected. For example, if you use {{ identity.entity.id }} in your policy, you are not affected, because identity.entity.id is randomly generated by OpenBao.
Even with this vulnerability patched: Using user controllable data in your policies is probably not the best idea.
Impact
The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions. Typical impact: unauthorized data access or execution of privileged operations.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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All three have been patched in OpenBao v2.6.0.
Frequently Asked Questions
- What is CVE-2026-71543? CVE-2026-71543 is a high-severity incorrect authorization vulnerability in github.com/openbao/openbao (go), affecting versions < 0.0.0-20260710001938-2d4ebafec5c5. It is fixed in 0.0.0-20260710001938-2d4ebafec5c5. The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions.
- Which versions of github.com/openbao/openbao are affected by CVE-2026-71543? github.com/openbao/openbao (go) versions < 0.0.0-20260710001938-2d4ebafec5c5 is affected.
- Is there a fix for CVE-2026-71543? Yes. CVE-2026-71543 is fixed in 0.0.0-20260710001938-2d4ebafec5c5. Upgrade to this version or later.
- Is CVE-2026-71543 exploitable, and should I be worried? Whether CVE-2026-71543 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-71543 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-71543? Upgrade
github.com/openbao/openbaoto 0.0.0-20260710001938-2d4ebafec5c5 or later.