What is the CVSS score of CVE-2026-2735?

CVE-2026-2735 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Opencms are affected by CVE-2026-2735?

CVE-2026-2735 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 5.4. Attackers could inject scripts to steal sessions or perform actions as authenticated users.

How to fix or mitigate CVE-2026-2735?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Opencms CVE-2026-2735

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-19 cve-coordination@incibe.es

XSS Opencms Alkacon

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:03 vuln.today

CVE Published

Feb 19, 2026 - 09:16 nvd

MEDIUM 5.4

DescriptionCVE.org

Stored Cross-Site Scripting (XSS) in Alkacon's OpenCms v18.0, which occurs when user input is not properly validated when sending a POST request to ‘/blog/new-article/org.opencms.ugc.CmsUgcEditService.gwt’ using the ‘text’ parameter.

AnalysisAI

Stored XSS in OpenCms v18.0 allows authenticated attackers to inject malicious scripts through the 'text' parameter in blog article creation requests, which execute in other users' browsers when they view the affected content. The vulnerability requires user interaction and results in limited impact to confidentiality and integrity, but currently has no available patch.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Opencms. Stored Cross-Site Scripting (XSS) in Alkacon's OpenCms v18.0, which occurs when user input is not properly validated when sending a POST request to ‘/blog/new-article/org.opencms.ugc.CmsUgcEditService.gwt’ using the ‘text’ parameter.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.