CVE-2021-25878 Cross-site scripting in n/a

Medium 6.1 Published 1 Nov 2021 Updated 9 Jul 2026

Remote attackers can steal administrator session cookies or perform administrative actions via reflected XSS in the videoName parameter.

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-2021-25878?

CVE-2021-25878 is a medium-severity cross-site scripting vulnerability in n/a, published on 1 Nov 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

AVideo/YouPHPTube 10.0 and prior is affected by multiple reflected Cross Script Scripting vulnerabilities via the videoName parameter which allows a remote attacker to steal administrators' session cookies or perform actions as an administrator.

Weakness: CWE-79

Which versions are affected by CVE-2021-25878?

It affects 1 product.

Products include Youphptube Youphptube.

How do I fix CVE-2021-25878?

No fix has been published for CVE-2021-25878 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-2021-25878 being exploited?

There is no known exploitation of CVE-2021-25878 in the wild and no public exploit code.

Sources

Also known as GHSA-jvc3-8j2m-3v97.