Events Manager Cross-site Scripting

The Events Manager WordPress plugin before 5.9.8 does not sanitise and escape some search parameter before outputing them in pages, which could lead to Cross-Site Scripting issues (2021-12-01, CVE-2020-35037)

The events-manager plugin through 5.9.5 for WordPress (aka Events Manager) is susceptible to Stored XSS due to improper encoding and insertion of data provided to the attribute map_style of shortcodes (locations_map and events_map) provided by the plugin. (2019-10-16, CVE-2019-16523)

The Events Manager plugin 5.9.4 for WordPress has XSS via the dbem_event_reapproved_email_body parameter to the wp-admin/edit.php?post_type=event&page=events-manager-options URI. (2019-04-12, CVE-2018-13137)

Cross-site scripting vulnerability in Events Manager plugin prior to version 5.9 for WordPress allows remote attackers to inject arbitrary web script or HTML via unspecified vectors. (2018-05-14, CVE-2018-0576)

The Events Manager plugin before 5.8.1.2 for WordPress allows XSS via the events-manager.js mapTitle parameter in the Google Maps miniature. (2018-03-26, CVE-2018-9020)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>