CVE-2021-24876 Registrations for The Events Calendar < 2.7.5 - Reflected Cross-Site Scripting

What is CVE-2021-24876?

CVE-2021-24876 is a medium-severity cross-site scripting vulnerability in Unknown Registrations for the Events Calendar – Event Registration Plugin, published on 29 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

The Registrations for the Events Calendar WordPress plugin before 2.7.5 does not escape the v parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting

Weakness: CWE-79

Which versions are affected by CVE-2021-24876?

It affects 1 product.

Products include Roundupwp Registrations for the Events Calendar.

How do I fix CVE-2021-24876?

No fix has been published for CVE-2021-24876 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-24876 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24876 exists.

Public exploit code: 1 Nuclei template.

Other vulnerabilities in Unknown Registrations for the Events Calendar – Event Registration Plugin

• CVE-2021-24943 Registrations for the Events Calendar < 2.7.6 - Unauthenticated SQL Injection Critical 9.8
• CVE-2024-7982 Registrations for The Events Calendar < 2.12.4 - Unauthenticated Stored XSS Critical 9.6
• CVE-2024-39638 WordPress Registrations for the Events Calendar plugin <= 2.12.2 - SQL Injection vulnerability High 8.5
• CVE-2024-10703 Registrations for The Events Calendar < 2.13.4 - Admin+ Stored XSS Medium 6.1
• CVE-2021-25083 Registrations for the Events Calendar < 2.7.10 - Reflected Cross-Site Scripting Medium 6.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j464-8gjj-h5jc.