Quick answers
- Is CVE-2026-86407 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86407 being exploited in the wild.
- How severe is CVE-2026-86407?
- Low severity, with a CVSS score of 3.7, published 13 September 2026.
- Which products and versions are affected?
- wpuserregistration User Registration & Membership before 5.2.8.
- Is there a fix for CVE-2026-86407?
- A patch was published on 2026-09-13: Version 5.2.8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-86407 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-86407?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is an authentication bypass and information disclosure vulnerability (CWE-200) in the membership confirmation page component. The vulnerable thank-you page fails to validate that the requesting user owns the account or has completed a transaction associated with the username parameter. An unauthenticated attacker can craft HTTP requests with arbitrary username parameters to retrieve user data if smart tags like {{user_email}} or {{membership_plan_details}} are present in the page's configurable message. The attack requires no authentication, no session cookies, and no user interaction—just HTTP GET requests with username parameters. The vulnerability is fixed in version 5.2.8.
Affected products
- wpuserregistration User Registration & Membership before 5.2.8
Timeline
- 2026-09-11: disclosed
- 2026-09-13: patched: Version 5.2.8