Cleaning of the image url to prevent XSS

The image URL was cleaned against an XSS attack.

This vulnerability affects the following application versions:

• All in One SEO Pack 2.3.11
• All in One SEO Pack 2.3.11.1
• All in One SEO Pack 2.3.11.2
• All in One SEO Pack 2.3.11.3
• All in One SEO Pack 2.3.11.4
• All in One SEO Pack 2.3.12
• All in One SEO Pack 2.3.12.1
• All in One SEO Pack 2.3.12.2
• All in One SEO Pack 2.3.12.2.1
• All in One SEO Pack 2.3.12.3
• All in One SEO Pack 2.3.12.4
• All in One SEO Pack 2.3.12.5
• All in One SEO Pack 2.3.13
• All in One SEO Pack 2.3.13.1
• All in One SEO Pack 2.3.13.2
• All in One SEO Pack 2.3.14
• All in One SEO Pack 2.3.14.1
• All in One SEO Pack 2.3.14.2
• All in One SEO Pack 2.3.15
• All in One SEO Pack 2.3.15.1
• All in One SEO Pack 2.3.15.2
• All in One SEO Pack 2.3.15.3
• All in One SEO Pack 2.3.16
• All in One SEO Pack 2.4
• All in One SEO Pack 2.4.1
• All in One SEO Pack 2.4.1.1