CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2021-26271
Medium (6.5). EPSS 2.0% chance of exploitation in the next 30 days. Fixed in ckeditor4-dev 4.16.
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).
Severity
- EPSS
- 2.0% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)
- CWE
- CWE-829
- Published
- Modified
- Record from
- the NVD, synced
Affected
- ckeditor:ckeditor
- oracle:agile_product_lifecycle_management
- oracle:application_express
- oracle:financial_services_analytical_applications_infrastructure
- oracle:jd_edwards_enterpriseone_tools
- oracle:siebel_ui_framework
- oracle:webcenter_sites
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jv4c-7jqq-m34x | npm | ckeditor4-dev | <4.16 | 4.16 |
References
- https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first
- https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first