CVE-2026-12170 describes a stored cross-site scripting vulnerability in the AcyMailing WordPress plugin, affecting all versions up to and including 10.10.2. The issue is due to improper neutralization of input during web page generation, specifically via the 'alignment' attribute. Authenticated attackers with contributor-level privileges or higher can inject arbitrary scripts that execute in the context of users viewing the injected content, potentially leading to session hijacking or other client-side impacts. The CVSS 3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, and no user interaction required.

Successful exploitation allows authenticated users with contributor or higher privileges to inject persistent malicious scripts into pages, which execute in the browsers of users who access those pages. This can lead to information disclosure and integrity impacts on affected users. There is no direct impact on availability. The vulnerability does not require user interaction and can be exploited remotely over the network.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and monitor for suspicious activity related to content injection. Avoid granting unnecessary privileges to users. Follow vendor updates closely for any released patches or official mitigations.