WordPress Plugin Vulnerabilities

Larsens Calender <= 1.2 - Stored Cross-Site Scripting (XSS)

Description

The plugin does not sanitise or encode the Title of the calendar entries when outputting them in the admin dashboard, leading to Stored XSS issue. Due to the lack of CSRF check, this can be exploited by a CSRF attack, making logged in administrators create malicious entries

Proof of Concept

Affects Plugins

Plugin icon
larsens-calender
No known fix

References

CVE
CVE-2020-23762
URL
http://hidden-one.co.in/2021/04/09/cve-2020-23762-stored-xss-vulnerability-in-the-larsens-calender-plugin-version/

Classification

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

Miscellaneous

Original Researcher
TH3 HIDD3N 0N3
Verified
Yes
WPVDB ID
e8b176d1-6a19-4b34-9cae-a928e013f0cd

Timeline

Publicly Published
2021-04-09 (about 4 years ago)
Added
2021-04-10 (about 4 years ago)
Last Updated
2021-04-12 (about 4 years ago)

Other

Published
Title
Published
2025-08-04
Title
Employee Directory < 4.5.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via noaccess_msg Parameter
Published
2024-06-04
Title
Newsletter < 8.3.5 - Unauthenticated Stored Cross-Site Scripting via np1
Published
2022-10-19
Title
Mantenimiento Web < 0.14 - Admin+ Stored XSS
Published
2025-08-04
Title
Download Counter < 1.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via name Parameter
Published
2015-08-13
Title
Ad Inserter <= 1.5.5 - Authenticated Cross-Site Scripting (XSS)