CVE-2026-125439 WordPress Kit (formerly ConvertKit) plugin <= 3.5.0 - Broken Access Control vulnerability
Attackers can exploit missing authorization checks in the Kit (formerly ConvertKit) WordPress plugin to perform restricted actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-125439?
CVE-2026-125439 is a medium-severity missing authorization vulnerability in Kit (formerly ConvertKit), published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing Authorization vulnerability in Kit Kit (formerly ConvertKit) convertkit allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Kit (formerly ConvertKit): from n/a through 3.5.0.
Weakness: CWE-862
Which versions are affected by CVE-2026-125439?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-125439?
No fix has been published for CVE-2026-125439 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-2026-125439 being exploited?
There is no known exploitation of CVE-2026-125439 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.