Description

The EG-Series plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's [series] shortcode in all versions up to, and including, 2.1.1 due to insufficient input sanitization and output escaping on user supplied attributes in the shortcode_title function. This makes it possible for authenticated attackers - with contributor-level access and above, on sites with the Classic Editor plugin activated - to inject arbitrary JavaScript code in the titletag attribute that will execute whenever a user access an injected page.

Classification

CVE ID: CVE-2025-4126

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.4

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

Affected Products

Vendor: emmanuelg

Product: EG-Series

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 7.65% (scored less or equal to compared to others)

EPSS Date: 2025-06-08 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-4126
https://www.wordfence.com/threat-intel/vulnerabilities/id/ab518a1b-304d-4b93-b807-65ef3941dd47?source=cve
https://plugins.trac.wordpress.org/browser/eg-series/trunk/lib/eg-plugin.inc.php#L546

Timeline