CVE-2020-9440

A cross-site scripting (XSS) vulnerability in the WSC plugin through 5.5.7.5 for CKEditor 4...

6.1 Medium

A cross-site scripting (XSS) vulnerability in the WSC plugin through 5.5.7.5 for CKEditor 4 allows remote attackers to run arbitrary web script inside an IFRAME element by injecting a crafted HTML element into the editor.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.31%Down 0.1 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

Record: CVE-2020-9440
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-9440
Updated: 2026-11-02

EUVDEUVD-2020-30260 No score

Record: EUVD-2020-30260
Updated: 2026-11-03

GitHub AdvisoriesGHSA-pv45-3557-fx76 6.1

A cross-site scripting (XSS) vulnerability in the WSC plugin through 5.5.7.5 for CKEditor 4...

Record: GHSA-pv45-3557-fx76
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

Record: CVE-2020-9440
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-9440 6.1

Record: UBUNTU-CVE-2020-9440
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`ckeditor` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 4.4.4+dfsg1-34.5.6+dfsg-14.5.7+dfsg-14.5.7+dfsg-24.5.7+dfsg-2ubuntu0.16.04.1~esm14.5.7+dfsg-2ubuntu0.16.04.1~esm24.5.7+dfsg-2ubuntu0.16.04.1~esm3	None known
`ckeditor` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 4.5.7+dfsg-24.5.7+dfsg-2ubuntu0.18.04.14.5.7+dfsg-2ubuntu0.18.04.1+esm14.5.7+dfsg-2ubuntu0.18.04.1+esm2	None known
`ckeditor` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 4.11.1+dfsg-14.12.1+dfsg-14.12.1+dfsg-1ubuntu0.14.12.1+dfsg-1ubuntu0.1+esm14.12.1+dfsg-1ubuntu0.1+esm2	None known
`ckeditor` Ubuntu:22.04:LTS	All versions, plus listed versions 4.16.0+dfsg-24.16.2+dfsg-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-9440 is a medium vulnerability (CVSS 6.1) in Ckeditor, published March 10, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.31%, the 70th percentile. No source names a fixed version.

References

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