CVE-2021-26271
Summary
| CVE | CVE-2021-26271 |
|---|---|
| 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 text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs 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: 0.019790000 probability, percentile 0.789910000 (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
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
MediumAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
PartialAV: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 | 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 | 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
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 |
| 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
- 179408 Debian Security Update for ckeditor (CVE-2021-26271)