Missing Authorization vulnerability in Kit Kit (formerly ConvertKit) convertkit allows Exploiting Incorrectly Configured Access Control Security… (CVE-2026-110880)

CVE-2026-110880 describes a missing authorization vulnerability in Kit (formerly ConvertKit) affecting versions up to 3.4.6. The flaw arises from incorrectly configured access control security levels, allowing an attacker with network access and no privileges to gain unauthorized read and write access to certain resources. The vulnerability does not impact system availability. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, reflecting network attack vector, low attack complexity, no privileges or user interaction required, unchanged scope, and limited confidentiality and integrity impact.

Successful exploitation can lead to unauthorized disclosure and modification of data within the affected Kit application. There is no impact on availability. The vulnerability requires no privileges or user interaction and can be exploited remotely over the network.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is currently available. Users should monitor vendor communications for updates and apply any forthcoming patches promptly.