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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected products
- bjornjohansen / BJ Lazy Load0 – 1.0.9
References
- MISChttps://www.wordfence.com/threat-intel/vulnerabilities/id/f443846f-4d70-4ca0-beeb-d2e839b14765?source=cve
- MISChttps://plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class-bjll.php#L121
- MISChttps://plugins.trac.wordpress.org/browser/bj-lazy-load/tags/1.0.9/inc/class-bjll.php#L210
- MISChttps://plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class-bjll.php#L210
- MISChttps://plugins.trac.wordpress.org/browser/bj-lazy-load/tags/1.0.9/inc/class-bjll.php#L121