What the vulnerability does
01Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in THEMECO Cornerstone cornerstone allows Stored XSS.This issue affects Cornerstone: from n/a through <= 7.7.3.
Explanation of Vulnerability in Simple Terms
02Summary
Cornerstone versions up to 7.7.3 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. An attacker with low-level access can craft a request that, when visited by another user, executes arbitrary JavaScript in their browser. This can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim.
What an attacker can do
03Attacker Capabilities
Inject and execute malicious JavaScript in other users' browsers to steal data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users' accounts and data are at risk if they interact with crafted content; site reputation and user trust may be compromised.
Conditions required to exploit
05Prerequisites
Attacker must have low-level user account access and the victim must visit a page containing the malicious payload.
Key dates
06Disclosure timeline
December 9, 2025
CVE published
April 28, 2026
Record updated