It is time to upgrade WordPress to the latest 3.5.1. It is a maintenance and security update.
From the announcement post, this maintenance release addresses 37 bugs with version 3.5, including:
- Editor: Prevent certain HTML elements from being unexpectedly removed or modified in rare cases.
- Media: Fix a collection of minor workflow and compatibility issues in the new media manager.
- Networks: Suggest proper rewrite rules when creating a new network.
- Prevent scheduled posts from being stripped of certain HTML, such as video embeds, when they are published.
- Suppress some warnings that could occur when a plugin misused the database or user APIs.
Additionally: Version 3.5.1 fixes a few security issues:
- Server-side request forgery (SSRF) and remote port scanning via pingbacks. Fixed by the WordPress security team.
- Cross-site scripting (XSS) via shortcodes and post content. Discovered by Jon Cave of the WordPress security team.
- Cross-site scripting (XSS) in the external library Plupload. Plupload 1.5.5 was released to address this issue.
It is very important to keep the program secure on server. Otherwise other program on the same account may be affected by the virus, or trojan program.