CVE-2026-2736 — MEDIUM (6.1)

Vulnerability 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.

CVSS Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Alkacon	Opencms	18.0.0

Related Weaknesses (CWE)

CWE-79

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkaThird Party Advisory

FAQ

What is CVE-2026-2736?

CVE-2026-2736 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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’ pa...

How severe is CVE-2026-2736?

CVE-2026-2736 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-2736?

Check the references section above for vendor advisories and patch information. Affected products include: Alkacon Opencms.