CVE-2026-67398 Missing authorization in WHMCS
Unauthenticated attackers can access WHMCS customer data via the 2Checkout payment gateway endpoint due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67398?
CVE-2026-67398 is a high-severity missing authorization vulnerability in WebPros WHMCS, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing authorization vulnerability has been discovered in 2Checkout payment gateway of WHMCS from 8.13.0 before 8.13.7, from 9.0.0 before 9.0.8, all other EOL versions from 4.5.0. The vulnerability allows an unauthenticated user to get WHMCS customer's data via 2Checkout payment gateway's endpoint under specific conditions.
Weakness: CWE-862
Which versions are affected by CVE-2026-67398?
How do I fix CVE-2026-67398?
No fix has been published for CVE-2026-67398 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-67398 being exploited?
There is no known exploitation of CVE-2026-67398 in the wild and no public exploit code.
Sources
Also known as GHSA-x84h-g4q5-82g8.