CVE-2026-2736

Reflected Cross-Site Scripting (XSS) vulnerability in Alkacon's OpenCms

Published Feb 19, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

The vulnerabilities have been fixed by the Alkacon team in version 19.0.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:alkacon:opencms:18.0.0:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Reflected Cross-Site Scripting (XSS) vulnerability in Alkacon's OpenCms
First Time appeared Alkacon
Alkacon opencms
Weaknesses CWE-79
CPEs cpe:2.3:a:alkacon:opencms:18.0:*:*:*:*:*:*:*
Vendors & Products Alkacon
Alkacon opencms
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
INCIBE
Published
Updated
Mar 9, 2026, 8:54 AM
Reserved
Feb 19, 2026, 8:18 AM
Status
Analyzed
Published
Feb 19, 2026, 9:16 AM
Modified
Jun 17, 2026, 10:31 AM