CVE-2026-2736
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
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| alkacon | opencms | 18.0.0 |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know