CVE-2026-1256
YS LeadGen – Popups, Opt-ins & Lead Capture <= 2.1.4 - Missing Authorization to Authenticated (Subscriber+) Stored Cross-Site Scripting via User Input
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.
INFO
Published Date :
Sept. 19, 2026, 9:16 a.m.
Last Modified :
Sept. 19, 2026, 9:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-1256
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the YS LeadGen plugin to the latest version.
- Verify that capability checks are properly implemented.
- Review AJAX endpoint security configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1256.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1256 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1256
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1256 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1256 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Sep. 19, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/1xxx/CVE-2026-1256.json">CVE-2026-1256</a> Added Reference https://plugins.trac.wordpress.org/browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L36 Added Reference https://plugins.trac.wordpress.org/browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L37 Added Reference https://plugins.trac.wordpress.org/browser/ysleadgen/tags/1.1.1/app/Controllers/Ajax.php#L38 Added Reference https://plugins.trac.wordpress.org/changeset/3577391 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/b62b8619-4348-4cf7-a572-aa6df20bdc3a?source=cve