CVE-2021-38337 RSVPMaker Excel <= 1.1 Reflected Cross-Site Scripting

Q: What is CVE-2021-38337?

CVE-2021-38337 is a medium-severity cross-site scripting vulnerability in RSVPMaker Excel, published on 10 Sep 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Q: Is CVE-2021-38337 being exploited?

There is no known exploitation of CVE-2021-38337 in the wild and no public exploit code.

Q: How do I fix CVE-2021-38337?

No fix has been published for CVE-2021-38337 yet. Limit exposure of the affected software until one is available.

Medium 6.1 Published 10 Sep 2021 Updated 2 May 2025

Attackers can inject arbitrary web scripts via reflected XSS in the RSVPMaker Excel WordPress plugin, potentially compromising user sessions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-38337?

CVE-2021-38337 is a medium-severity cross-site scripting vulnerability in RSVPMaker Excel, published on 10 Sep 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 RSVPMaker Excel WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to a reflected $_SERVER["PHP_SELF"] value in the ~/phpexcel/PHPExcel/Shared/JAMA/docs/download.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.1.

Weakness: CWE-79

Which versions are affected by CVE-2021-38337?

It affects 1 product.

Products include Carrcommunications Rsvpmaker Excel.

How do I fix CVE-2021-38337?

No fix has been published for CVE-2021-38337 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-2021-38337 being exploited?