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CVE-2026-27591

CRITICAL

9.9

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.

CVE Details

CVSS v3.1 Score9.9

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/11/2026

Last Modified3/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

wintercms:winter

Weaknesses (CWE)

CWE-284CWE-639CWE-915

References

https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6(security-advisories@github.com)

https://wintercms.com/releases/v1.0.477(security-advisories@github.com)

https://wintercms.com/releases/v1.1.12(security-advisories@github.com)

https://wintercms.com/releases/v1.2.12(security-advisories@github.com)

IOC Correlations

No correlations recorded

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