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    CVE-2026-47657

    HumHub is an Open Source Enterprise Social Network. In versions 1.13.0 through 1.18.2, a missing authorization check in the Space member management controller allowed any authenticated user to trigger the removal of all members from any Space, regardless of their own role or membership in that Space. Versions 1.13.0 through 1.18.2 are affected. The vulnerability has been patched in version 1.18.3, and all users are encouraged to upgrade to this version or later immediately. No known workaround is available.

    Published:Jul 21, 2026
    Last Modified:Jul 21, 2026
    EPS:Jul 21, 2026
    EPSS Score:
    CVSS Score:7.1

    Affected Products

    Vendor
    Humhub
    Product
    Humhub

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

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    CVE-2026-18526 (CVSS 7.4) — HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in th…
    CVE-2026-29048 (CVSS 6.9) — HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability wa…
    CVE-2025-64442 (CVSS 7.1) — HumHub is an Open Source Enterprise Social Network. Versions below 1.17.4 have a XSS vulnerability in the Meta…
    CVE-2024-52043 (CVSS 6.9) — Generation of Error Message Containing Sensitive Information in HumHub GmbH & Co. KG - HumHub on Linux allows:…
    CVE-2022-31133 (CVSS 5.9) — HumHub is an Open Source Enterprise Social Network. Affected versions of HumHub are vulnerable to a stored Cro…
    CVE-2017-20028 (CVSS 5.6) — A vulnerability was found in HumHub 0.20.1/1.0.0-beta.3. It has been classified as critical. This affects an u…
    CVE-2017-20027 (CVSS 4.3) — A vulnerability was found in HumHub up to 1.0.1 and classified as problematic. Affected by this issue is some …
    CVE-2017-20026 (CVSS 4.3) — A vulnerability has been found in HumHub up to 1.0.1 and classified as problematic. Affected by this vulnerabi…

    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