CVE-2026-1256 Cross-site scripting in YS LeadGen – Popup Builder, Popup Maker & Form Builder for WordPress | Lead Generation, Email Marketing, Sales, Conversions, Opt-Ins & Subscribers
Authenticated subscribers can inject malicious JavaScript into popups via missing authorization checks, leading to stored XSS attacks against site visitors.
- 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-2026-1256?
CVE-2026-1256 is a medium-severity cross-site scripting vulnerability in ysinnovations YS LeadGen – Popup Builder, Popup Maker & Form Builder for WordPress | Lead Generation, Email Marketing, Sales, Conversions, Opt-Ins & Subscribers, published on 19 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The YS LeadGen plugin for WordPress is vulnerable to authorization bypass and Stored Cross-Site Scripting via multiple AJAX endpoints in all versions up to, and including, 2.1.4 due to missing capability checks on popup management actions. This makes it possible for authenticated attackers, with Subscriber-level access and above, to create arbitrary popups and inject malicious JavaScript that executes when the popup is displayed, leading to Stored XSS.
Weakness: CWE-79
Which versions are affected by CVE-2026-1256?
How do I fix CVE-2026-1256?
No fix has been published for CVE-2026-1256 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-2026-1256 being exploited?
There is no known exploitation of CVE-2026-1256 in the wild and no public exploit code.
Sources
Also known as GHSA-h43h-55xh-wjgc.