CVE-2021-26271
MEDIUM severity · CVSS 6.5 · CWE-829
6.5CVSS MEDIUM
Summary
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).
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://www.oracle.com//security-alerts/cpujul2021.html ↗
Additional information
- NVD record
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch
- https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-firstAdvisory
- https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416Advisory