What the vulnerability does
01Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in wpopal Opal Service opal-service allows Stored XSS.This issue affects Opal Service: from n/a through <= 1.9.1.
Explanation of Vulnerability in Simple Terms
02Summary
Opal Service versions up to 1.9.1 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction and can affect the confidentiality, integrity, and availability of the site.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers and steal data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other visitors; site data and user sessions at risk if exploited.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account and the victim must visit a page containing the injected script.
Key dates
06Disclosure timeline
October 27, 2025
CVE published
April 28, 2026
Record updated