CVE-2026-1256 json
YS LeadGen – Popups, Opt-ins & Lead Capture <= 2.1.4 - Missing Authorization to Authenticated (Subscriber+) Stored Cross-Site Scripting via User Input
published 2026-09-19 50 d ago modified 2026-09-21 48 d ago also EUVD-2026-83567
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 50 d ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- ysinnovations YS LeadGen – Popup Builder, Popup Maker & Form Builder for WordPress | Lead Generation, Email Marketing, Sales, Conversions, Opt-Ins & Subscribers
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
- wordfence.com /threat-intel/vulnerabilities/id/b62b8619-4348-4cf7-a572-aa6df20bdc3a?source=cve
- plugins.trac.wordpress.org /browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L37
- plugins.trac.wordpress.org /browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L38
- plugins.trac.wordpress.org /browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L36
- plugins.trac.wordpress.org /changeset/3577391
Sources
- CVE List CVE-2026-1256
- NVD CVE-2026-1256
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.