CVE-2026-86406 User Registration & Membership < 5.2.8 - Subscriber+ Privilege Escalation via Membership Purchase
Authenticated users can escalate privileges to administrator by exploiting missing capability checks during membership purchase.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86406?
CVE-2026-86406 is a high-severity vulnerability in Unknown User Registration & Membership, published on 13 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The User Registration & Membership WordPress plugin before 5.2.8 does not check the capability of the user making a membership purchase, and does not validate the payment method or the plan submitted with it, allowing any authenticated user such as a subscriber to be granted the WordPress role attached to a paid plan without paying for it. Where the site owner has mapped a plan to a privileged role, this leads to privilege escalation up to administrator.
Weakness: CWE-269
Which versions are affected by CVE-2026-86406?
How do I fix CVE-2026-86406?
No fix has been published for CVE-2026-86406 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-86406 being exploited?
There is no known exploitation of CVE-2026-86406 in the wild and no public exploit code.
Sources
Also known as GHSA-23fc-j83w-rxq7.