CVE-2025-13739: CryptX <= 4.0.5 - Authenticated (Contributor+) Stored Cross-Site Scripting

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-05 · updated 2026-09-25
Weakness: CWE-79

Description

The CryptX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's `cryptx` shortcode in all versions up to, and including, 4.0.5 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

d3395 CryptX: through 4.0.5

References

https://plugins.trac.wordpress.org/browser/cryptx/tags/4.0.4/classes/CryptX.php#L1295
https://plugins.trac.wordpress.org/browser/cryptx/tags/4.0.4/classes/CryptX.php#L149
https://plugins.trac.wordpress.org/browser/cryptx/tags/4.0.4/classes/CryptX.php#L237
https://plugins.trac.wordpress.org/browser/cryptx/tags/4.0.4/classes/CryptX.php#L604
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3416363%40cryptx&new=3416363%40cryptx&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/2f8cb7d7-eb40-403e-85de-c16200ee424d?source=cve

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