CVE-2019-18839 Cross-site scripting in n/a
Stored XSS in FUDForum allows attackers to execute arbitrary code on the server by tricking admins into viewing malicious user profiles.
- 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-2019-18839?
CVE-2019-18839 is a critical cross-site scripting vulnerability in n/a, published on 13 Nov 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
FUDForum 3.0.9 is vulnerable to Stored XSS via the nlogin parameter. This may result in remote code execution. An attacker can use a user account to fully compromise the system using a POST request. When the admin visits the user information, the payload will execute. This will allow for PHP files to be written to the web root, and for code to execute on the remote server.
Which versions are affected by CVE-2019-18839?
It affects 1 product.
Products include Fudforum Fudforum.
How do I fix CVE-2019-18839?
No fix has been published for CVE-2019-18839 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-2019-18839 being exploited?
There is no known exploitation of CVE-2019-18839 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-56fg-j4m5-gggf.