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MEDIUM severity

CVE-2019-11818 — opencms-core

MEDIUMFix: alkacon/opencms-core@b20c293

CVE-2019-11818 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.opencms:opencms-core. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for org.opencms:opencms-core — see the affected versions and patch details below.

Alkacon OpenCMS XSS via New User module

Also known asGHSA-c8j6-gqq8-4prj
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.42%0.84%1.26%0.2%0.8%May 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.opencms:opencms-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.opencms:opencms-coreall versions11.0.0org.opencms:opencms-core:11.0.0

Affected Products

1 product · 1 configurations
Application
opencmsalkacon
≤ 10.5.4
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Alkacon OpenCMS v10.5.4 and before is affected by stored cross site scri…

openwall.comNVDMay 2019

Report on github.com

github.comNVDMay 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.opencms:opencms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.opencms:opencms-core to 11.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-11818 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2019-11818: opencms-core XSS — Fixed in 11.0.0