Description
The BJ Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `filter_images()` function in all versions up to, and including, 1.0.9. This is due to the use of regex-based HTML processing (`preg_replace`) that does not properly handle HTML attribute boundaries when replacing `src` attributes, allowing crafted content inside a `class` attribute value to be promoted to real DOM attributes after processing. 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.
References5
- plugins.trac.wordpress.org/browser/bj-lazy-load/tags/1.0.9/inc/…
- plugins.trac.wordpress.org/browser/bj-lazy-load/tags/1.0.9/inc/…
- plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class…
- plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class…
- www.wordfence.com/threat-intel/vulnerabilities/id/f443846f-4d70…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 9 · as of 14 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.