CVE-2026-12497 Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content vulnerability
The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content WordPress plugin before 4.16.18 does not consistently enforce the role restriction configured on its front-end registration role-selection field. The set of roles offered to the visitor and the set of roles the registration handler accepts are derived by two different parsers, and for some valid ways of configuring the offered roles the handler ignores the restriction and falls back to accepting any non-administrator role. Combined with the absence of a nonce on the public registration handler, this allows an unauthenticated visitor to register an account with a higher role, such as Editor or Author, than the form was configured to offer.
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Unknown Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- < 4.16.18
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-12497 affects Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content and involves security-control failure. Successful exploitation may affect the confidentiality, integrity, or availability of the affected workflow. Treat this as a high-priority fix, especially when the affected component or endpoint is reachable by untrusted users. Upgrade Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content to 4.16.18 or a later vendor-supported fixed release.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content.
- Compare the installed version with the recorded affected range: < 4.16.18.
- Upgrade Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content to 4.16.18 or a later vendor-supported fixed release.
- Until patched, disable the affected Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content feature or plugin and restrict its public and administrator endpoints.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content; remove access that is not required.
- Review application, system, proxy, and audit logs for requests and behavior linked to the affected feature and CVE.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
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Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-12497 in place.
- Use a safe regression test to confirm the affected security-control failure path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-12497?
Unknown Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content versions listed as affected should be reviewed: < 4.16.18.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.