CVE-2021-24604 Availability Calendar < 1.2.2 - Authenticated Stored Cross-Site Scripting
High-privilege users can inject malicious scripts via category names in the Availability Calendar plugin, leading to stored XSS attacks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-24604?
CVE-2021-24604 is a medium-severity cross-site scripting vulnerability in Unknown Availability Calendar, published on 20 Sep 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The Availability Calendar WordPress plugin before 1.2.2 does not sanitise or escape its Category Names before outputting them in page/post where the associated shortcode is embed, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed
Weakness: CWE-79
Which versions are affected by CVE-2021-24604?
It affects 1 product.
Products include Offshorewebmaster Availability Calendar.
How do I fix CVE-2021-24604?
No fix has been published for CVE-2021-24604 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-2021-24604 being exploited?
There is no known exploitation of CVE-2021-24604 in the wild and no public exploit code.
Other vulnerabilities in Unknown Availability Calendar
Sources
Also known as GHSA-p555-vm74-xq5v.