CVE-2021-22540

    Dashboard / Vulnerabilities / CVE-2021-22540

    CVE-2021-22540

    Published: 22 Apr 2021Last Modified: 9 Jul 2026

    Summary:

    Details: Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.

    References: https://github.com/dart-lang/sdk/security/advisories/GHSA-3rfv-4jvg-9522, https://github.com/dart-lang/sdk/commit/ce5a1c2392debce967415d4c09359ff2555e3588

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -7c8c6b3053d0ba91fcf15f81c45650184dc27e88

    Affected versions

    2.12.2
    2.12.1
    2.12.0

    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
    CVE-2021-22540 | CVE-DB