DEBIAN-CVE-2020-26956

    Dashboard / Vulnerabilities / DEBIAN-CVE-2020-26956

    DEBIAN-CVE-2020-26956

    Published: 9 Dec 2020Last Modified: 11 Sept 2026
    Upstream:
    CVE-2020-26956

    Summary:

    Details: In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

    References: https://security-tracker.debian.org/tracker/CVE-2020-26956

    Affected packages

    Package

    Name: firefox-esr

    Purl: pkg:deb/debian/firefox-esr?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -78.5.0esr-1

    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
    DEBIAN-CVE-2020-26956 | CVE-DB