---
id: CVE-2025-9873
title: >-
  The a3 Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting in all versions up to, and including, 2.7.5 due to insufficient
  input sanitization and output escaping on user supplied attributes
summary: >-
  The a3 Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting in all versions up to, and including, 2.7.5 due to insufficient
  input sanitization and output escaping on user supplied attributes. This makes
  it possible…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2025-12-13'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:10:00.160'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9873'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L430
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3377146%40a3-lazy-load&new=3377146%40a3-lazy-load&sfp_email=&sfph_mail=
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/0d837229-52fa-42ae-b733-8fbeb444f110?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00289
epssPercentile: 0.19635
ingestedAt: '2026-10-07T19:44:15.659Z'
---

## Overview

The a3 Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.7.5 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.