CrowdSec
6/10CrowdSec Score

Calendar event multi view - XSS (CVE-2021-24498)

Published on02-08-2021
First seen on07-04-2025

66Exploiting IPs reported

The Calendar Event Multi View WordPress plugin before 1.4.01 does not sanitise or escape the 'start' and 'end' GET parameters before outputting them in the page (via php/edit.php), leading to a reflected Cross-Site Scripting issue.

CrowdSec analysis

CVE-2021-24498 is a vulnerability affecting the Calendar Event Multi View WordPress plugin, where improper handling of input allows attackers to inject arbitrary web content via reflected cross-site scripting.

CrowdSec has been tracking this vulnerability and its exploits since 7th of April 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2021-24498 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2021-24498 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2021-24498 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Exploitation attempts commonly involve URLs with / that include parameter sequences related to cpmvc_id=1&cpmvc_do_action=mvparse&f=edit, with further manipulation of date-related parameters.

Exploitation

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Detected IPs

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Protection

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Blocklist

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