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CVE-2026-27591

CRITICAL
10.0
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-27591
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-02-20 17:40 UTC
Published
2026-03-11 21:25 UTC
Last updated
2026-03-12 14:23 UTC
Primary CWE
CWE-284
CWE-284: Improper Access Control
Vendor / Product
wintercms / winter
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
wintercms winter — >= 1.2.0, < 1.2.12, >= 1.1.0, < 1.1.12, < 1.0.477
Weakness (CWE)
CWESourceDescription
CWE-284 cna CWE-284: Improper Access Control
CWE-639 cna CWE-639: Authorization Bypass Through User-Controlled Key
CWE-915 cna CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References (4)
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