UBUNTU-CVE-2018-12423

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    UBUNTU-CVE-2018-12423

    Published: 14 Jun 2018Last Modified: 4 Feb 2026
    Upstream:
    CVE-2018-12423
    Aliases:
    USN-6076-1

    Summary:

    Details: In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.

    References: https://ubuntu.com/security/CVE-2018-12423, https://github.com/matrix-org/synapse/pull/3397, https://bugs.debian.org/901549, https://github.com/matrix-org/matrix-doc/issues/1304, https://matrix.org/blog/2018/06/14/security-update-synapse-0-31-2/, https://ubuntu.com/security/notices/USN-6076-1, https://www.cve.org/CVERecord?id=CVE-2018-12423

    Affected packages

    Package

    Name: matrix-synapse

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.24.0+dfsg-1ubuntu0.1~esm1

    Affected versions

    0.19.2+dfsg-6

    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