CVE-2022-39203

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    CVE-2022-39203

    Published: 13 Sept 2022Last Modified: 21 Oct 2026

    Summary: Parsing issue in matrix-org/node-irc leading to room takeovers

    Details: matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The vulnerability has been patched in matrix-appservice-irc 0.35.0. As a workaround operators may disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39203.json, https://github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-xvqg-mv25-rwvw, https://nvd.nist.gov/vuln/detail/CVE-2022-39203, https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -b52ac9ec9e45fe82fb3eb9c1a5e420c1eba73b9b

    Affected versions

    0.33.1
    0.33.0
    0.33.0-rc2

    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-2022-39203 | CVE-DB