CVE-2026-7430

Description

The Post Snippets plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 4.0.19. This is due to insufficient output escaping of imported snippet content when rendering JavaScript variables in the post editor. Specifically, the `jqueryUiDialog()` method in `WPEditor.php` embeds snippet content directly into JavaScript string literals without escaping double quotes (the quote-escaping code on line 214 is commented out). When snippets are imported via the Import/Export feature, the content bypasses WordPress's `wp_magic_quotes()` (which would otherwise add protective backslashes), allowing double quotes in snippet content to break out of the JavaScript string context. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts via a malicious import file that execute whenever any administrator accesses a post editor page. Please note that this does not affect single-site installations as administrators already have the `unfiltered_html` capability.

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CVSS v3.1 Score

4.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0024

Probability of exploitation

0.15%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://plugins.trac.wordpress.org/browser/post-snippets/tags/4.0.19/src/PostSnippets/DBTable.php#L114 https://plugins.trac.wordpress.org/browser/post-snippets/tags/4.0.19/src/PostSnippets/WPEditor.php#L218 https://plugins.trac.wordpress.org/browser/post-snippets/tags/4.1.1/src/PostSnippets/WPEditor.php#L20 https://plugins.trac.wordpress.org/browser/post-snippets/tags/4.1.1/src/PostSnippets/WPEditor.php#L221 https://plugins.trac.wordpress.org/browser/post-snippets/tags/4.1.1/src/PostSnippets/WPEditor.php#L227 https://plugins.trac.wordpress.org/browser/post-snippets/trunk/src/PostSnippets/DBTable.php#L114 https://plugins.trac.wordpress.org/browser/post-snippets/trunk/src/PostSnippets/WPEditor.php#L218 https://www.wordfence.com/threat-intel/vulnerabilities/id/59dc2448-491c-478f-a784-c727057b126b?source=cve

Frequently Asked Questions

What is CVE-2026-7430? +

The Post Snippets plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 4.0.19. This is due to insufficient output escaping of imported snippet content when rendering JavaScript variables in the post editor. Specifically, the `jqueryUiDialog()` method in `WPEditor.php` embeds snippet content directly into JavaScript string literals without escaping double quotes (the quote-escaping code on line 214 is commented out). When snippets are imported via the Import/Export feature, the content bypasses WordPress's `wp_magic_quotes()` (which would otherwise add protective backslashes), allowing double quotes in snippet content to break out of the JavaScript string context. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts via a malicious import file that execute whenever any administrator accesses a post editor page. Please note that this does not affect single-site installations as administrators already have the `unfiltered_html` capability. It has a CVSS v3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2026-7430? +

CVE-2026-7430 has a CVSS v3.1 score of 4.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0024, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-7430? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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