GHSA-jv4c-7jqq-m34x

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    GHSA-jv4c-7jqq-m34x

    Published: 24 May 2022Last Modified: 10 Sept 2026

    Summary: CKEditor 4 ReDoS Vulnerability

    Details: 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).

    References: https://nvd.nist.gov/vuln/detail/CVE-2021-26271, https://github.com/ckeditor/ckeditor4, https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416, https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first, https://www.oracle.com//security-alerts/cpujul2021.html, https://www.oracle.com/security-alerts/cpuoct2021.html

    Affected packages

    Package

    Name: ckeditor4-dev

    Purl: pkg:npm/ckeditor4-dev

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.16

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-jv4c-7jqq-m34x | CVE-DB