The Simple News plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'news' shortcode in all versions up to, and including, 2.8 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.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

The EnvíaloSimple: Email Marketing y Newsletters plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.3. This is due to missing or incorrect nonce validation on the gallery_add function. This makes it possible for unauthenticated attackers to upload malicious files via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Simple Popup Newsletter WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/simple-popup-newsletter.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.4.7.

The ThemeREX Addons plugin before 2020-03-09 for WordPress lacks access control on the /trx_addons/v2/get/sc_layout REST API endpoint, allowing for PHP functions to be executed by any users, because includes/plugin.rest-api.php calls trx_addons_rest_get_sc_layout with an unsafe sc parameter.

SQL injection vulnerability in news.php in RSS Simple News (RSSSN), when magic_quotes_gpc is disabled, allows remote attackers to execute arbitrary SQL commands via the pid parameter.

Static code injection vulnerability in post.php in Simple PHP News 1.0 final allows remote attackers to inject arbitrary PHP code into news.txt via the post parameter, and then execute the code via a direct request to display.php. NOTE: some of these details are obtained from third party information.

Multiple static code injection vulnerabilities in post.php in Simple PHP News 1.0 final allow remote attackers to inject arbitrary PHP code into news.txt via the (1) title or (2) date parameter, and then execute the code via a direct request to display.php. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Multiple directory traversal vulnerabilities in Simple PHP Newsletter 1.5 allow remote attackers to read arbitrary files via a .. (dot dot) in the olang parameter to (1) mail.php and (2) mailbar.php.

Cross-site scripting (XSS) vulnerability in Tor World Tor Search 1.1 and earlier, I-Navigator 4.0, Mobile Frontier 2.1 and earlier, Diary.cgi (aka Quotes of the Day) 1.5 and earlier, Tor News 1.21 and earlier, Simple BBS 1.3 and earlier, Interactive BBS 1.3 and earlier, Tor Board 1.1 and earlier, Simple Vote 1.1 and earlier, and Com Vote 1.2 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.