TI-2026-02341 Aliases CVE-2026-2735 GHSA-74m2-9pf8-f794

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

LOW 23CWE-79Published 2026-02-19 · Updated 2026-02-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00211 11th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Alkacon	OpenCms	18.0	—	No fix listed	CNA

OpenCms VendorAlkacon Affected 18.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:alkacon:opencms:18.0.0:::::::*	18.0.0	Vulnerable	Alkacon

cpe:2.3:a:alkacon:opencms:18.0.0:*:*:*:*:*:*:* Versions 18.0.0 Vulnerable ·Alkacon

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-2735
2026-10-03 Alias added: GHSA-74m2-9pf8-f794

References

Patch 1

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacons-opencms

TI-2024-28583 Cross Site Scripting vulnerability in Create/Modify article function in Alkacon OpenCMS… CVSS 3.1MEDIUM 6.5
TI-2023-19187 An arbitrary file upload vulnerability in the component /workplace#!explorer of Alkacon… CVSS 3.1MEDIUM 6.1
TI-2024-27633 A stored cross-site scripting (XSS) vulnerability in Alkacon OpenCMS v17.0 allows… CVSS 3.1MEDIUM 5.4
TI-2024-27632 A stored cross-site scripting (XSS) vulnerability in Alkacon OpenCMS v17.0 allows… CVSS 3.1MEDIUM 5.4
TI-2023-15113 A stored cross-site scripting (XSS) vulnerability in alkacon-OpenCMS v11.0.0.0 allows… CVSS 3.1MEDIUM 5.4
TI-2021-07974 OpenCMS - Stored Cross-Site Scripting (XSS) in Sitemap CVSS 3.1MEDIUM 5.4

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences