CVE-2026-25616 Cross-site scripting in Blesta

Medium 4.7 Published 3 Feb 2026 Updated 5 Feb 2026

Attackers can inject malicious scripts into Blesta web application pages, potentially leading to session hijacking or code execution.

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-2026-25616?

CVE-2026-25616 is a medium-severity cross-site scripting vulnerability in Blesta, published on 3 Feb 2026. 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

Blesta 3.x through 5.x before 5.13.3 mishandles input validation, aka CORE-5665.

Weakness: CWE-79

Which versions are affected by CVE-2026-25616?

It affects 1 product.

Products include Phillipsdata Blesta.

How do I fix CVE-2026-25616?

No fix has been published for CVE-2026-25616 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-2026-25616 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25616 exists.

Public exploit code: 1 Nuclei template.

Sources

Also known as GHSA-3q94-vm9h-5h6v.