CVE-2023-4021 Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting
Administrators can inject scripts via Google API settings in Modern Events Calendar Lite, affecting multi-site or restricted HTML installations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-4021?
CVE-2023-4021 is a medium-severity cross-site scripting vulnerability in webnus/ Modern Events Calendar Lite, published on 20 Oct 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Modern Events Calendar lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Google API key and Calendar ID in versions up to, but not including, 7.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Weakness: CWE-79
Which versions are affected by CVE-2023-4021?
It affects 1 product.
Products include Webnus Modern Events Calendar Lite.
How do I fix CVE-2023-4021?
No fix has been published for CVE-2023-4021 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-2023-4021 being exploited?
There is no known exploitation of CVE-2023-4021 in the wild and no public exploit code.
Other vulnerabilities in webnus/ Modern Events Calendar Lite
- CVE-2021-24946 Modern Events Calendar < 6.1.5 - Unauthenticated Blind SQL Injection
- CVE-2021-24149 Modern Events Calendar Lite < 5.16.6 - Authenticated SQL Injection
- CVE-2021-24146 Modern Events Calendar Lite < 5.16.5 - Unauthenticated Events Export
- CVE-2021-24145 Modern Events Calendar Lite < 5.16.5 - Authenticated Arbitrary File Upload leading to RCE
- CVE-2021-24925 Modern Events Calendar Lite < 6.1.5 - Reflected Cross-Site Scripting
Sources
Also known as GHSA-mxc9-v9vg-4xfw.