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MEDIUM severity

CVE-2020-27193 — ckeditor4

MEDIUM

CVE-2020-27193 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in ckeditor4. A fix is available for ckeditor4 — see the affected versions and patch details below.

Improper Neutralization of Input During Web Page Generation in CKEditor4

Also known asGHSA-4m44-5j2g-xf64
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk
0.51%1.19%1.87%2.55%1.0%2.1%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

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.

27other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
ckeditor4npm
73Kdownloads / week

Description

A cross-site scripting (XSS) vulnerability in the Color Dialog plugin for CKEditor 4.15.0 allows remote attackers to run arbitrary web script after persuading a user to copy and paste crafted HTML code into one of editor inputs.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmckeditor4all versions4.15.1npm install ckeditor4@4.15.1

Affected Products

9 products · 23 configurations
Application
ckeditorckeditor
1 version
4.15.0
Application
agile product lifecycle managementoracle
2 versions
9.3.59.3.6
Application
application expressoracle
< 21.1.0.00.01
range
Application
banking party managementoracle
1 version
2.7.0
Application
banking platformoracle
5 versions
2.4.02.7.02.7.12.8.02.9.0
Application
commerce merchandisingoracle
6 versions
11.0.011.1.011.2.011.3.011.3.111.3.2

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ckeditor4, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ckeditor4 to 4.15.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27193 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

A cross-site scripting (XSS) vulnerability in the Color Dialog plugin for CKEditor 4.15.0 allows remote attackers to run arbitrary web script after persuading a user to copy and paste crafted HTML code into one of editor inputs.
O3 Security · Impact-Aware SCA

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CVE-2020-27193: ckeditor4 XSS — Fixed in 4.15.1