What is CVE-2026-1889?

CVE-2026-1889 is a medium-severity vulnerability in Outgrow, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.

How severe is CVE-2026-1889?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Outgrow

CVE-2026-1889

The Outgrow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' attribute of the 'outgrow' shortcode in all versions up to, and including, 2.1. This is due to insufficient input sanitization and output escaping o…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Outgrow — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.wordfence.com/threat-intel/vulnerabilities/id/29e9ad80-6a02-494a-9d53-0f147…
wordpress.org/plugins/outgrow/
plugins.trac.wordpress.org/browser/outgrow/trunk/newOutgrow.php
plugins.trac.wordpress.org/browser/outgrow/tags/2.1/newOutgrow.php

Frequently asked questions

What is CVE-2026-1889?: CVE-2026-1889 is a medium-severity vulnerability in Outgrow, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.
How severe is CVE-2026-1889?: Medium severity. CVSS v3 base score is 6.4 out of 10.