How severe is CVE-2026-2735?

CVE-2026-2735 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-2735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2735?

CVE-2026-2735 affects Alkacon Opencms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-2735 have an EU (EUVD) identifier?

Yes. CVE-2026-2735 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8332.

When was CVE-2026-2735 published?

CVE-2026-2735 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-2735

CVE-2026-2735 is a medium-severity vulnerability in Alkacon Opencms with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8332
Weakness: CWE-79
Affected product: Alkacon Opencms
Published: 2026-02-19
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-2735?: 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.
How severe is CVE-2026-2735?: CVE-2026-2735 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-2735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2735?: CVE-2026-2735 affects Alkacon Opencms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2735 have an EU (EUVD) identifier?: Yes. CVE-2026-2735 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8332.
When was CVE-2026-2735 published?: CVE-2026-2735 was published on 2026-02-19 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:alkacon:opencms:18.0.0:*:*:*:*:*:*:*

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