CVE-2021-4253 ctrlo lenio Ticket Lenio.pm cross site scripting

Low 3.5 Published 18 Dec 2022 Updated 15 Apr 2025

Remote attackers can inject malicious scripts via the site_id argument in the Lenio ticket handler, requiring a patch to mitigate.

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-2021-4253?

CVE-2021-4253 is a low-severity cross-site scripting vulnerability in ctrlo lenio, published on 18 Dec 2022. 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 vulnerability, which was classified as problematic, was found in ctrlo lenio. Affected is an unknown function in the library lib/Lenio.pm of the component Ticket Handler. The manipulation of the argument site_id leads to cross site scripting. It is possible to launch the attack remotely. The name of the patch is 7a1f90bd2a0ce95b8338ec0926902da975ec64d9. It is recommended to apply a patch to fix this issue. VDB-216210 is the identifier assigned to this vulnerability.

Weakness: CWE-707

Which versions are affected by CVE-2021-4253?

It affects 1 product.

Products include Ctrlo Lenio.

How do I fix CVE-2021-4253?

No fix has been published for CVE-2021-4253 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-2021-4253 being exploited?

There is no known exploitation of CVE-2021-4253 in the wild and no public exploit code.

Sources

Also known as GHSA-qqw2-fgff-h6h4.