What is CVE-2019-11818?

CVE-2019-11818 is a medium-severity vulnerability in Alkacon Opencms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-05-08.

How severe is CVE-2019-11818?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Alkacon Opencms

CVE-2019-11818

Alkacon OpenCMS v10.5.4 and before is affected by stored cross site scripting (XSS) in the module New User (/opencms/system/workplace/admin/accounts/user_new.jsp). This allows an attacker to insert arbitrary JavaScript as user input (First Name or Last Name), which will be executed whenever the affected snippet is loaded.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Alkacon Opencms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/alkacon/opencms-core/issues/635 (Exploit, Third Party Advisory)
www.openwall.com/lists/oss-security/2019/04/30/3 (Exploit, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2019-11818?: CVE-2019-11818 is a medium-severity vulnerability in Alkacon Opencms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-05-08.
How severe is CVE-2019-11818?: Medium severity. CVSS v3 base score is 6.1 out of 10.