CVE-2023-45150

    Dashboard / Vulnerabilities / CVE-2023-45150

    CVE-2023-45150

    Published: 16 Oct 2023Last Modified: 28 Oct 2026

    Summary: Inviting excessive long email addresses to a calendar event makes the Nextcloud server unresponsive

    Details: Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. It is recommended that the Nextcloud Calendar app is upgraded to 4.4.4. The only workaround for users unable to upgrade is to disable the calendar app.

    References: https://hackerone.com/reports/2058337, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45150.json, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r936-8gwm-w452, https://nvd.nist.gov/vuln/detail/CVE-2023-45150, https://github.com/nextcloud/calendar/pull/5358

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4296a4bd9688d0bcd724f2473d9c5769923fa23e
    Fixed -910b7d393f7baeeef462c55929f6d7fe2538d4a1

    Affected versions

    v4.4.3
    v4.4.2
    v4.4.2-rc1
    v4.4.1
    v4.4.0
    v4.4.0-rc.3
    v4.4.0-rc2
    v4.4.0-rc1
    v4.4.0-beta1
    v4.4.0-alpha2

    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-2023-45150 | CVE-DB