CVE-2021-26271

moderate-risk
Published 2021-01-26

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).

Do I need to act?

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0.62% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (11)

Affected Vendors

Oracle Ckeditor

References (8)

Vendor Advisory https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contras...
Release Notes https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416
Patch https://www.oracle.com//security-alerts/cpujul2021.html
Patch https://www.oracle.com/security-alerts/cpuoct2021.html
Vendor Advisory https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contras...
Release Notes https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416
Patch https://www.oracle.com//security-alerts/cpujul2021.html
Patch https://www.oracle.com/security-alerts/cpuoct2021.html
42
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 2/34 · Minimal
Exposure 16/34 · Moderate