CVE-2021-26272

Summary

CVE	CVE-2021-26272
State	PUBLISHED
Assigner	mitre
Source Priority	CVE Program / NVD first with legacy fallback
Published	2021-01-26 21:15:12 UTC
Updated	2026-08-25 16:28:27 UTC
Description	It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.022230000 probability, percentile 0.813530000 (date 2026-08-25)

Problem Types: CWE-829 | n/a

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	6.5	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`
2.0	[email protected]	Primary	4.3		`AV:N/AC:M/Au:N/C:N/I:N/A:P`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector

Network

Access Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

AV:N/AC:M/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Ckeditor	Ckeditor	All	All	All	All
Application	Oracle	Agile Product Lifecycle Management	9.3.5	All	All	All
Application	Oracle	Agile Product Lifecycle Management	9.3.6	All	All	All
Application	Oracle	Application Express	All	All	All	All
Application	Oracle	Banking Party Management	2.7.0	All	All	All
Application	Oracle	Commerce Merchandising	11.1.0	All	All	All
Application	Oracle	Commerce Merchandising	11.2.0	All	All	All
Application	Oracle	Commerce Merchandising	All	All	All	All
Application	Oracle	Financial Services Analytical Applications Infrastructure	8.1.0	All	All	All
Application	Oracle	Financial Services Analytical Applications Infrastructure	8.1.1	All	All	All
Application	Oracle	Financial Services Analytical Applications Infrastructure	All	All	All	All
Application	Oracle	Financial Services Model Management And Governance	All	All	All	All
Application	Oracle	Jd Edwards Enterpriseone Tools	All	All	All	All
Application	Oracle	Siebel Ui Framework	All	All	All	All
Application	Oracle	Webcenter Sites	12.2.1.3.0	All	All	All
Application	Oracle	Webcenter Sites	12.2.1.4.0	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Na	N/a	affected n/a	Not specified

References

Reference	Source	Link	Tags
Oracle Critical Patch Update Advisory - October 2021	af854a3a-2127-422b-91ae-364da2661108	www.oracle.com	Patch, Third Party Advisory
Oracle Critical Patch Update Advisory - July 2021	af854a3a-2127-422b-91ae-364da2661108	www.oracle.com	Patch, Third Party Advisory
Oracle Critical Patch Update Advisory - January 2022	af854a3a-2127-422b-91ae-364da2661108	www.oracle.com	Not Applicable, Third Party Advisory
CKEditor 4.16 with improved image pasting, High Contrast support and a new color API	af854a3a-2127-422b-91ae-364da2661108	ckeditor.com	Vendor Advisory
ckeditor4/CHANGES.md at major · ckeditor/ckeditor4 · GitHub	af854a3a-2127-422b-91ae-364da2661108	github.com	Release Notes, Third Party Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Legacy QID Mappings

179922 Debian Security Update for ckeditor (CVE-2021-26272)
20232 Oracle Database 21c Critical Patch Update - October 2021
20233 Oracle Database 19c Critical Patch Update - October 2021
20234 Oracle Database 12.2.0.1 Critical Patch Update - October 2021
20235 Oracle Database 12.2.0.1 Critical Patch Update - October 2021 (Unauthenticated)
20237 Oracle Database 12.1.0.2 Critical Patch Update - October 2021
20238 Oracle Database 12.1.0.2 Critical Patch Update - October 2021 (Unauthenticated)
980331 Nodejs (npm) Security Update for ckeditor4 (GHSA-wpvm-wqr4-p7cw)