CVE-2021-4074 WHMCS Bridge <= 6.1 Subscriber+ Stored Cross-Site Scripting
Low-level authenticated users can inject arbitrary web scripts via the cc_whmcs_bridge_url parameter due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-4074?
CVE-2021-4074 is a medium-severity cross-site scripting vulnerability in WHMCS Bridge, published on 18 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The WHMCS Bridge WordPress plugin is vulnerable to Stored Cross-Site Scripting via the cc_whmcs_bridge_url parameter found in the ~/whmcs-bridge/bridge_cp.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 6.1. Due to missing authorization checks on the cc_whmcs_bridge_add_admin function, low-level authenticated users such as subscribers can exploit this vulnerability.
Which versions are affected by CVE-2021-4074?
It affects 1 product.
Products include I-Plugins Whmcs Bridge.
How do I fix CVE-2021-4074?
No fix has been published for CVE-2021-4074 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-2021-4074 being exploited?
There is no known exploitation of CVE-2021-4074 in the wild and no public exploit code.
Other vulnerabilities in WHMCS Bridge
Sources
Also known as GHSA-25m8-2fq7-2r56.