CVE-2026-54611

    Dashboard / Vulnerabilities / CVE-2026-54611

    CVE-2026-54611

    Published: 8 Sept 2026Last Modified: 11 Sept 2026

    Summary: InstantCMS has Remote Code Execution in package installer

    Details: InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allows remote authenticated attackers to execute any PHP code via the component installer. It is possible to upload a malicious component into the server, however, it won't be installed, but upload files will be executed. Normally all php files in upload folder are not executed, however, by uploading custom .htaccess it becomes possible. Version 2.18.2 contains a fix.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54611.json, https://github.com/instantsoft/icms2/security/advisories/GHSA-vvgv-h28h-p2m5, https://nvd.nist.gov/vuln/detail/CVE-2026-54611, https://github.com/instantsoft/icms2/commit/44f3a9d04a3207c82cdc756599cbdf084a02858f

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -44f3a9d04a3207c82cdc756599cbdf084a02858f

    Affected versions

    2.18.1
    2.18.0

    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-2026-54611 | CVE-DB