CVE-2026-2736
Undergoing Analysis Undergoing Analysis - In Progress

Reflected XSS in OpenCms v18.0 Enables Session Hijacking

Publication date: 2026-02-19

Last updated on: 2026-02-23

Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)

Description
Reflected Cross-site Scripting (XSS) in Alkacon's OpenCms v18.0, which allows an attacker to execute JavaScript code in the victim's browser by sending the victim a malicious URL containing the ‘q’ parameter in ‘/search/index.html’. This vulnerability can be exploited to steal sensitive user information such as session cookies, or to perform actions while impersonating the user.

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Meta Information

Published
2026-02-19
Last Modified
2026-02-23
Generated
2026-07-06
AI Q&A
2026-02-19
EPSS Evaluated
2026-07-05
NVD
CVE-2026-2736

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
alkacon opencms 18.0.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Reflected Cross-site Scripting (XSS) issue in Alkacon's OpenCms version 18.0. It occurs when an attacker sends a malicious URL containing a specially crafted 'q' parameter to the victim. When the victim accesses this URL, the attacker's JavaScript code is executed in the victim's browser.

The vulnerability exists in the '/search/index.html' endpoint of the application.

Impact Analysis

Exploitation of this vulnerability allows an attacker to execute arbitrary JavaScript code in the context of the victim's browser session. This can lead to theft of sensitive user information such as session cookies.

Additionally, the attacker may perform actions on behalf of the user by impersonating them, potentially leading to unauthorized operations within the affected application.

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