CVE-2023-2787

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    CVE-2023-2787

    Published: 16 Jun 2023Last Modified: 12 Aug 2026

    Summary: Collapsed Reply Threads APIs leak message contents from private channels

    Details: Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

    References: https://mattermost.com/security-updates/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/2xxx/CVE-2023-2787.json, https://nvd.nist.gov/vuln/detail/CVE-2023-2787

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 25e8c1fcddb1154de49480eb5cd7eb085507d138
    Fixed -None

    Affected versions

    7.10.0

    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-2023-2787 | CVE-DB