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CVE-2026-27591

CVE-2026-27591 · Winter: Privilege escalation by authenticated backend users

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12.

CVSS 10.0 · Critical · EPSS 0.7% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • winter

    Versions
    • >= 1.2.0, < 1.2.12: Affected
    • >= 1.1.0, < 1.1.12: Affected
    • < 1.0.477: Affected

    No fix published

  • winter/wn-backend-module Packagist

    Versions
    • v1.2.0
    • v1.2.1
    • v1.2.10
    • v1.2.11
    • v1.2.2
    • v1.2.3
    • v1.2.4
    • v1.2.5
    • v1.2.6
    • v1.2.7
    • v1.2.8
    • v1.2.9
    Affected ranges
    • ECOSYSTEM: ≥ 1.2.0, < 1.2.12

    Update to 1.2.12

  • winter/wn-backend-module Packagist

    Versions
    • v1.1.10
    • v1.1.11
    • v1.1.2
    • v1.1.3
    • v1.1.4
    • v1.1.5
    • v1.1.6
    • v1.1.7
    • v1.1.8
    • v1.1.9
    Affected ranges
    • ECOSYSTEM: ≥ 1.1.0, < 1.1.12

    Update to 1.1.12

  • winter/wn-backend-module Packagist

    Versions
    • v1.0.473
    • v1.0.474
    • v1.0.475
    Affected ranges
    • ECOSYSTEM: < 1.0.477

    Update to 1.0.477

Original sources

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