CVE-2026-39900 Cacti: Reflected XSS via tab parameter in auth_profile.php JavaScript context
Attackers can execute arbitrary JavaScript in victim browsers via the tab parameter in Cacti's auth_profile.php, potentially leading to session hijacking.
- 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
- Available
What is CVE-2026-39900?
CVE-2026-39900 is a medium-severity cross-site scripting vulnerability in Cacti Cacti, published on 24 Jun 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
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.
Weakness: CWE-79
Which versions are affected by CVE-2026-39900?
It affects 1 product.
Products include Cacti Cacti.
How do I fix CVE-2026-39900?
Upgrade to a fixed version.
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-2026-39900 being exploited?
There is no known exploitation of CVE-2026-39900 in the wild and no public exploit code.
Other vulnerabilities in Cacti Cacti
- CVE-2022-46169 Cacti Command Injection
- CVE-2026-39893 Cacti: Pre-authentication SQL injection via rfilter RLIKE clause in graph_view.php
- CVE-2026-39938 Cacti: Unauthenticated RCE on Graph Image
- CVE-2026-39955 Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php
- CVE-2023-39361 Unauthenticated SQL Injection in graph_view.php in Cacti
Sources
Also known as DEBIAN-CVE-2026-39900, GHSA-34rf-frc3-v48r, UBUNTU-CVE-2026-39900.