CVE-2023-4599

MEDIUM 6.4

Email Encoder <= 2.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

CVSS Score

6.4

EPSS Score

0.0%

EPSS Percentile

0th

The Email Encoder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'eeb_mailto' shortcode in versions up to, and including, 2.1.8 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. A partial patch was issued in version 2.1.8. The vulnerability was fully patched in 2.1.9.

CWE	CWE-79
Vendor	onlineoptimisation
Product	email encoder – protect email addresses and phone numbers
Published	Aug 30, 2023
Last Updated	Apr 8, 2026

Stay Ahead of the Next One

Get instant alerts for onlineoptimisation email encoder – protect email addresses and phone numbers

Be the first to know when new medium vulnerabilities affecting onlineoptimisation email encoder – protect email addresses and phone numbers are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

onlineoptimisation / Email Encoder – Protect Email Addresses and Phone Numbers

0 ≤ 2.1.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/e90f04e4-eb4c-4822-89c6-79f553987c37?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/email-encoder-bundle/tags/2.1.7/core/includes/classes/class-email-encoder-bundle-run.php#L529 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/2958823/email-encoder-bundle#file60 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/2994384/email-encoder-bundle/trunk?contextall=1&old=2958823&old_path=%2Femail-encoder-bundle%2Ftrunk#file0

Credits

István Márton