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MEDIUM severity

CVE-2023-37905 — ckeditor-wordcount-plugin

MEDIUMFix: w8tcha/CKEditor-WordCount-Plugin@0f03b3e

CVE-2023-37905 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in ckeditor-wordcount-plugin. A fix is available for ckeditor-wordcount-plugin — see the affected versions and patch details below.

Cross-site Scripting (XSS) in Source Mode of Editor in ckeditor-wordcount-plugin

Also known asGHSA-q9w4-w667-qqj4
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 26, 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-2023-37905.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk
0.00%0.38%0.75%1.13%0.5%0.6%Apr 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

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
ckeditor-wordcount-pluginnpm
2Kdownloads / week

Description

ckeditor-wordcount-plugin is an open source WordCount Plugin for CKEditor. It has been discovered that the ckeditor-wordcount-plugin plugin for CKEditor4 is susceptible to cross-site scripting when switching to the source code mode. This issue has been addressed in version 1.17.12 of the ckeditor-wordcount-plugin plugin and users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmckeditor-wordcount-pluginall versions1.17.12npm install ckeditor-wordcount-plugin@1.17.12

Affected Products

1 product · 1 configurations
Application
ckeditor-wordcount-pluginckeditor-wordcount-plugin_project
< 1.17.12
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update ckeditor-wordcount-plugin to 1.17.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-37905 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

### Problem It has been discovered that the `ckeditor-wordcount-plugin` plugin for CKEditor4 is susceptible to cross-site scripting when switching to the source code mode. ### Solution Update to version 1.17.12 of the `ckeditor-wordcount-plugin` plugin. ### Credits * @sypets for reporting this finding to the TYPO3 Security Team * @ohader for fixing the issue on behalf of the TYPO3 Security Team
O3 Security · Impact-Aware SCA

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CVE-2023-37905: ckeditor-wordcount — Fixed in 1.17.12