CVE-2021-28001 Cross-site scripting in n/a

Medium 5.4 Published 19 Aug 2021 Updated 3 Aug 2024

Remote attackers can execute arbitrary code via a cross-site scripting vulnerability in the Comments parameter of Textpattern CMS.

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-2021-28001?

CVE-2021-28001 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Aug 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

A cross-site scripting vulnerability was discovered in the Comments parameter in Textpattern CMS 4.8.4 which allows remote attackers to execute arbitrary code via a crafted payload entered into the URL field. The vulnerability is triggered by users visiting https://site.com/articles/welcome-to-your-site#comments-head.

Weakness: CWE-79

Which versions are affected by CVE-2021-28001?

It affects 1 product.

Products include Textpattern Textpattern.

How do I fix CVE-2021-28001?

No fix has been published for CVE-2021-28001 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-2021-28001 being exploited?

There is no known exploitation of CVE-2021-28001 in the wild and no public exploit code.

Sources

Also known as GHSA-36x9-48hm-r28q.