CVE-2020-21496 Cross-site scripting in n/a

Medium 6.1 Published 4 Oct 2021 Updated 4 Aug 2024

Attackers can execute arbitrary web scripts via the sitebrief parameter in the admin settings page of Xiuno BBS.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-21496?

CVE-2020-21496 is a medium-severity cross-site scripting vulnerability in n/a, published on 4 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A cross-site scripting (XSS) vulnerability in the component /admin/?setting-base.htm of Xiuno BBS 4.0.4 allows attackers to execute arbitrary web scripts or HTML via the sitebrief parameter.

Weakness: CWE-79

Which versions are affected by CVE-2020-21496?

It affects 1 product.

Products include Xiuno Xiunobbs.

How do I fix CVE-2020-21496?

No fix has been published for CVE-2020-21496 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-2020-21496 being exploited?

There is no known exploitation of CVE-2020-21496 in the wild and no public exploit code.

Sources

Also known as GHSA-m37x-h78g-g7x6.