CVE-2011-4957: WordPress

Medium severity, CVSS 5.0. EPSS: 3.2% chance of exploitation in the next 30 days.

The make_clickable function in wp-includes/formatting.php in WordPress before 3.1.1 does not properly check URLs before passing them to the PCRE library, which allows remote attackers to cause a denial of service (crash) via a comment with a crafted URL that triggers many recursive calls.

Affected products

• WordPress WordPress: up to and including 3.1; version 0.71 only; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.1.1 only; …

Published 2012-06-27. Last modified 2026-06-16.