Alkacon OpenCms 18.0 URL /search/index.html q cross site scripting

Summaryinfo

A vulnerability was found in Alkacon OpenCms 18.0. It has been rated as problematic. Impacted is an unknown function of the file /search/index.html of the component URL Handler. Performing a manipulation of the argument q results in cross site scripting. This vulnerability is reported as CVE-2026-2736. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Alkacon OpenCms 18.0. It has been classified as problematic. This affects an unknown function of the file /search/index.html of the component URL Handler. The manipulation of the argument q with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

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.

The weakness was disclosed by Gonzalo Aguilar García. The advisory is shared at incibe.es. This vulnerability is uniquely identified as CVE-2026-2736 since 02/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

By approaching the search of inurl:search/index.html it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Alkacon

Name

• OpenCms

Version

• 18.0

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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