CVE-2021-24927 My Calendar < 3.2.18 - Subscriber+ Reflected Cross-Site Scripting
An authenticated attacker can execute arbitrary JavaScript in the victim's browser via a reflected XSS vulnerability in the My Calendar plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-24927?
CVE-2021-24927 is a medium-severity cross-site scripting vulnerability in Unknown My Calendar, published on 29 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
The My Calendar WordPress plugin before 3.2.18 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
Weakness: CWE-79
Which versions are affected by CVE-2021-24927?
It affects 1 product.
Products include My Calendar Project My Calendar.
How do I fix CVE-2021-24927?
No fix has been published for CVE-2021-24927 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-2021-24927 being exploited?
There is no known exploitation of CVE-2021-24927 in the wild and no public exploit code.
Other vulnerabilities in Unknown My Calendar
Sources
Also known as GHSA-gcvg-gpgp-f6cf.