PT-2026-20773 · Alkacon · Alkacon Opencms

Published 2026-02-19 · Updated 2026-02-19 · CVE-2026-2736

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Alkacon OpenCms version 18.0

Description A Reflected Cross-site Scripting (XSS) issue exists in Alkacon's OpenCms version 18.0. This allows an attacker to execute JavaScript code in a user's browser. Exploitation occurs by sending a malicious URL containing the q parameter in the '/search/index.html' endpoint to a victim. Successful exploitation could lead to the theft of sensitive user information, such as session cookies, or allow an attacker to perform actions while impersonating the user.

Recommendations Apply a fix for Alkacon OpenCms version 18.0 to address the reflected XSS issue. As a temporary workaround, sanitize the q parameter in the '/search/index.html' endpoint to prevent the execution of malicious JavaScript code.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-2736

Affected Products

Alkacon Opencms

References · 5

• https://osv.dev/vulnerability/CVE-2026-2736 · Vendor Advisory
• https://incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacons-opencms · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-2736 · Security Note
• https://twitter.com/CVEnew/status/2024411318975910210 · Twitter Post
• https://t.me/CVEtracker/45096 · Telegram Post