CVE-2023-39543 Cross-site scripting in LuxCal Web Calendar

Medium 6.1 Published 21 Aug 2023 Updated 4 Oct 2024

Remote unauthenticated attackers can execute arbitrary scripts in users' browsers via a cross-site scripting vulnerability in LuxCal Web Calendar.

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-2023-39543?

CVE-2023-39543 is a medium-severity cross-site scripting vulnerability in LuxSoft LuxCal Web Calendar, published on 21 Aug 2023. 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

Cross-site scripting vulnerability in LuxCal Web Calendar prior to 5.2.3M (MySQL version) and LuxCal Web Calendar prior to 5.2.3L (SQLite version) allows a remote unauthenticated attacker to execute an arbitrary script on the web browser of the user who is using the product.

Weakness: CWE-79

Which versions are affected by CVE-2023-39543?

It affects 1 product.

Products include Luxsoft Luxcal Web Calendar.

How do I fix CVE-2023-39543?

No fix has been published for CVE-2023-39543 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-2023-39543 being exploited?

There is no known exploitation of CVE-2023-39543 in the wild and no public exploit code.

Sources

Also known as GHSA-qqrg-2fcm-mwrq.