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CVE-2026-27591

Winter: Privilege escalation by authenticated backend users

Published: Mar 11, 2026Updated: Mar 19, 2026 Sources: CVE List NVD GHSACWE-284
9.9CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 62.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-284CWE-639CWE-915

Affected Products

winterwintercms
Mixed
Web & CMS Plugins / cms-core
winter/wn-backend-modulePackagistOSS Libraries
wintercmsoss-projectWeb & CMS Pluginsaka winter cms
packagistpackage-ecosystemOSS Libraries

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6
github.com
https://wintercms.com/releases/v1.0.477
wintercms.com
https://wintercms.com/releases/v1.1.12
wintercms.com
and 3 more references View all →

Timeline

Published
Mar 11, 2026
Last Updated
Mar 19, 2026

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