CVE-2026-15931 Simple Membership < 4.7.8 - Unauthenticated Stored XSS via PayPal Subscription Subscriber Name
Unauthenticated attackers can inject malicious JavaScript via PayPal subscriber names, leading to admin session hijacking in the Simple Membership plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-15931?
CVE-2026-15931 is a medium-severity cross-site scripting vulnerability in Unknown Simple Membership, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Simple Membership WordPress plugin before 4.7.8 does not sanitise a subscriber name value received from an unauthenticated payment approval request, nor escape it when displaying it in the administration dashboard, allowing unauthenticated attackers to store arbitrary JavaScript that executes in an administrator's session.
Weakness: CWE-79
Which versions are affected by CVE-2026-15931?
How do I fix CVE-2026-15931?
No fix has been published for CVE-2026-15931 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15931 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15931 exists.
Sources
Also known as GHSA-cc2x-fmqx-2g5v.