CVE-2026-27591
Winter: Privilege escalation by authenticated backend users
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.
INFO
Published Date :
March 11, 2026, 10:16 p.m.
Last Modified :
March 19, 2026, 5:37 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update Winter CMS to 1.0.477 or later.
- Update Winter CMS to 1.1.12 or later.
- Update Winter CMS to 1.2.12 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27591.
| URL | Resource |
|---|---|
| https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6 | Patch Vendor Advisory |
| https://wintercms.com/releases/v1.0.477 | Release Notes |
| https://wintercms.com/releases/v1.1.12 | Release Notes |
| https://wintercms.com/releases/v1.2.12 | Release Notes |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27591 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27591
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27591 vulnerability anywhere in the article.
-
Daily CyberSecurity
Winter CMS Urgently Patches Critical 10.0 CVSS Privilege Escalation Flaw
Winter CMS, the popular open-source content management system favored by developers for its Laravel-based simplicity and rapid prototyping, has issued an urgent security update. The vulnerability, tra ... Read more
The following table lists the changes that have been made to the
CVE-2026-27591 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 19, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.477 *cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:* versions from (including) 1.1.0 up to (excluding) 1.1.12 *cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:* versions from (including) 1.2.0 up to (excluding) 1.2.12 Added Reference Type GitHub, Inc.: https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6 Types: Patch, Vendor Advisory Added Reference Type GitHub, Inc.: https://wintercms.com/releases/v1.0.477 Types: Release Notes Added Reference Type GitHub, Inc.: https://wintercms.com/releases/v1.1.12 Types: Release Notes Added Reference Type GitHub, Inc.: https://wintercms.com/releases/v1.2.12 Types: Release Notes -
New CVE Received by [email protected]
Mar. 11, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-284 Added CWE CWE-639 Added CWE CWE-915 Added Reference https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6 Added Reference https://wintercms.com/releases/v1.0.477 Added Reference https://wintercms.com/releases/v1.1.12 Added Reference https://wintercms.com/releases/v1.2.12