How severe is CVE-2026-2736?

CVE-2026-2736 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-2736 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2736?

CVE-2026-2736 affects Alkacon Opencms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2736?

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

Does CVE-2026-2736 have an EU (EUVD) identifier?

Yes. CVE-2026-2736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8334.

When was CVE-2026-2736 published?

CVE-2026-2736 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-2736

CVE-2026-2736 is a medium-severity vulnerability in Alkacon Opencms with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v4: 5.1
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8334
Weakness: CWE-79
Affected product: Alkacon Opencms
Published: 2026-02-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-2736?: 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.
How severe is CVE-2026-2736?: CVE-2026-2736 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-2736 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2736?: CVE-2026-2736 affects Alkacon Opencms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2736?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2736 have an EU (EUVD) identifier?: Yes. CVE-2026-2736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8334.
When was CVE-2026-2736 published?: CVE-2026-2736 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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