CVE-2020-35479

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    CVE-2020-35479

    Published: 18 Dec 2020Last Modified: 8 Jul 2026

    Summary:

    Details: MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/, https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html, https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html, https://www.debian.org/security/2020/dsa-4816, https://phabricator.wikimedia.org/T268938

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 33c8b6247e6ca4e68e1982d3950986b632fc4f0d
    Fixed -3e26b5ff1468f98cf306575d125b29a6645bf2ea

    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
    CVE-2020-35479 | CVE-DB