CVE-2021-22878

    Dashboard / Vulnerabilities / CVE-2021-22878

    CVE-2021-22878

    Published: 3 Mar 2021Last Modified: 7 Aug 2026

    Summary:

    Details: Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/, https://nextcloud.com/security/advisory/?id=NC-SA-2021-005, https://hackerone.com/reports/896522, https://github.com/nextcloud/server/pull/25234

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -fd26cb18701139187a14b6d6ef72ebe660b183a8

    Affected versions

    v20.0.6RC1
    v20.0.5
    v20.0.5RC2
    v20.0.5RC1
    v20.0.4
    v20.0.3
    v20.0.3RC2
    v20.0.2
    v20.0.2RC2
    v20.0.2RC1
    v20.0.1
    v20.0.1RC1
    v20.0.0
    v20.0.0RC2
    v20.0.0RC1
    v20.0.0beta4
    v20.0.0beta3
    v20.0.0beta2
    v20.0.0beta1

    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-2021-22878 | CVE-DB