CVE-2021-24147 Modern Events Calendar Lite < 5.16.5 - Authenticated Stored Cross-Site Scripting (XSS)

What is CVE-2021-24147?

CVE-2021-24147 is a medium-severity cross-site scripting vulnerability in Unknown Modern Events Calendar Lite, published on 18 Mar 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

Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.

Weakness: CWE-79

Which versions are affected by CVE-2021-24147?

It affects 1 product.

Products include Webnus Modern Events Calendar Lite.

How do I fix CVE-2021-24147?

No fix has been published for CVE-2021-24147 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-2021-24147 being exploited?

There is no known exploitation of CVE-2021-24147 in the wild and no public exploit code.

Other vulnerabilities in Unknown Modern Events Calendar Lite

• CVE-2021-24946 Modern Events Calendar < 6.1.5 - Unauthenticated Blind SQL Injection Critical 9.8
• CVE-2021-24149 Modern Events Calendar Lite < 5.16.6 - Authenticated SQL Injection High 8.8
• CVE-2021-24146 Modern Events Calendar Lite < 5.16.5 - Unauthenticated Events Export High 7.5
• CVE-2021-24145 Modern Events Calendar Lite < 5.16.5 - Authenticated Arbitrary File Upload leading to RCE High 7.2
• CVE-2021-24925 Modern Events Calendar Lite < 6.1.5 - Reflected Cross-Site Scripting Medium 6.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-38c2-7994-ggcm.