CVE-2018-20583

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    CVE-2018-20583

    Published: 30 Dec 2018Last Modified: 8 Jul 2026

    Summary:

    Details: Cross-site scripting (XSS) vulnerability in the PHP League CommonMark library versions 0.15.6 through 0.18.x before 0.18.1 allows remote attackers to insert unsafe URLs into HTML (even if allow_unsafe_links is false) via a newline character (e.g., writing javascript as javascri%0apt).

    References: https://commonmark.thephpleague.com/changelog/, https://github.com/thephpleague/commonmark/releases/tag/0.18.1, https://github.com/thephpleague/commonmark/issues/337

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 91742543c25fecedc84a4883d2919213e04a73b7
    Fixed -None

    Affected versions

    0.18.0

    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