WordPress Plugin Vulnerabilities

My Calendar < 3.2.18 - Subscriber+ Reflected Cross-Site Scripting

Description

The plugin does not sanitise and escape the callback parameter of the mc_post_lookup AJAX action (available to any authenticated user) before outputting it back in the response, leading to a Reflected Cross-Site Scripting issue

Proof of Concept

Affects Plugins

Plugin icon
my-calendar
Fixed in 3.2.18

References

CVE
CVE-2021-24927

Classification

Type
XSS
OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79
CVSS
5.4 (medium)

Miscellaneous

Original Researcher
Krzysztof Zając
Submitter
Krzysztof Zając
Submitter website
https://kazet.cc/
Verified
Yes
WPVDB ID
86f3acc7-8902-4215-bd75-6105d601524e

Timeline

Publicly Published
2021-11-01 (about 4 years ago)
Added
2021-11-01 (about 4 years ago)
Last Updated
2022-04-13 (about 3 years ago)

Other

Published
Title
Published
2025-09-22
Title
Real Estate Manager <= 7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting
Published
2025-01-16
Title
Explara Membership <= 0.0.7 - Reflected Cross-Site Scripting
Published
2024-12-11
Title
Hello Event Widgets For Elementor < 1.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting
Published
2023-02-27
Title
Dashboard Widgets Suite < 3.2.2 - Admin+ Stored XSS
Published
2021-09-07
Title
WP Sitemap Page < 1.7.0 - Admin+ Stored Cross Site Scripting