CVE-2021-3816 Cross-site scripting in Cacti
Authenticated users with User Management permissions can inject arbitrary HTML into group settings, potentially leading to session hijacking or malicious script execution.
- 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
- Available
What is CVE-2021-3816?
CVE-2021-3816 is a medium-severity cross-site scripting vulnerability in Cacti Cacti, published on 19 Jan 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
Cacti 1.1.38 allows authenticated users with User Management permissions to inject arbitrary HTML in the group_prefix field during the creation of a new group via "Copy" method at user_group_admin.php.
Weakness: CWE-79
Which versions are affected by CVE-2021-3816?
It affects 1 product.
Products include Cacti Cacti.
How do I fix CVE-2021-3816?
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-2021-3816 being exploited?
There is no known exploitation of CVE-2021-3816 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-2021-3816, GHSA-6gq5-766m-4c86, UBUNTU-CVE-2021-3816.