CVE-2021-3831 Cross-site Scripting (XSS) - Reflected in gnuboard/gnuboard5
Attackers can inject malicious scripts into gnuboard5 pages, potentially stealing user data or hijacking sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3831?
CVE-2021-3831 is a high-severity cross-site scripting vulnerability in gnuboard/gnuboard5, published on 14 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
gnuboard5 is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Weakness: CWE-79
Which versions are affected by CVE-2021-3831?
It affects 1 product.
Products include Gnuboard Gnuboard5.
How do I fix CVE-2021-3831?
No fix has been published for CVE-2021-3831 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-2021-3831 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3831 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-xq54-j4gh-pm4j.