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MEDIUM severity

CVE-2024-5520 — opencms-core

MEDIUMFix: alkacon/opencms-core@b05a5ac

CVE-2024-5520 is a medium-severity (CVSS 6.4) Cross-site Scripting (XSS) vulnerability in org.opencms:opencms-core. A fix is available for org.opencms:opencms-core — see the affected versions and patch details below.

Cross-Site Scripting stored in Alkacon OpenCMS

Also known asGHSA-vg6x-pchq-98mg
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-5520.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs21th percentile — riskier than 21% of all scored CVEsHighest risk
0.00%0.26%0.52%0.78%0.2%0.3%May 26Sep 26Nov 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

Two Cross-Site Scripting vulnerabilities have been discovered in Alkacon's OpenCMS affecting version 16, which could allow a user: with sufficient privileges to create and modify web pages through the admin panel, can execute malicious JavaScript code, after inserting code in the title field. Another could having the roles of gallery editor or VFS resource manager will have the permission to upload images in the .svg format containing JavaScript code. The code will be executed the moment another user accesses the image.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.opencms:opencms-core≥ 16.0&&< 17.017.0org.opencms:opencms-core:17.0

Affected Products

1 product · 1 configurations
Application
opencmsalkacon
1 version
16.0.0

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 17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-5520 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

Two Cross-Site Scripting vulnerabilities have been discovered in Alkacon's OpenCMS affecting version 16, which could allow a user: with sufficient privileges to create and modify web pages through the admin panel, can execute malicious JavaScript code, after inserting code in the `title` field. Another could having the roles of gallery editor or VFS resource manager will have the permission to upload images in the .svg format containing JavaScript code. The code will be executed the moment another user accesses the image.
O3 Security · Impact-Aware SCA

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CVE-2024-5520: opencms-core XSS — Fixed in 17.0