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

Quick assessment

Affected
wintercms winter
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Winter是Winter开源的一款基于 Laravel PHP 框架的免费开源内容管理系统。 Winter 1.0.477之前版本、1.1.12之前版本和1.2.12之前版本存在安全漏洞，该漏洞源于权限分配不当，可能导致经过身份验证的后端用户通过特制请求提升账户访问权限。

CVSS 10.0 · Critical EPSS 0.77% · P54

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-27591

Vulnerability Information
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Vulnerability Title
Winter: Privilege escalation by authenticated backend users
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Winter 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Winter是Winter开源的一款基于 Laravel PHP 框架的免费开源内容管理系统。 Winter 1.0.477之前版本、1.1.12之前版本和1.2.12之前版本存在安全漏洞，该漏洞源于权限分配不当，可能导致经过身份验证的后端用户通过特制请求提升账户访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
wintercms winter >= 1.2.0, < 1.2.12 -

II. Public POCs for CVE-2026-27591

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III. Intelligence Information for CVE-2026-27591

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Vendor Advisories for CVE-2026-27591 (1)

Vendor Pages for CVE-2026-27591 (3)

IV. Related Vulnerabilities

Same product: winter
Same vendor: wintercms
Same weakness: CWE-284

V. Comments for CVE-2026-27591

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