Winter: Broken access control in `Cms\Controllers\Index` allows cross-template actions and unauthorized asset uploads

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-32639
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 18:16:30 UTC
Updated2026-08-29 03:17:05 UTC
DescriptionWinter CMS is a content management system built on the Laravel PHP framework. In versions up to and including 1.2.12, the CMS section's Theme Editor AJAX handlers did not enforce per-template-type permission checks, allowing a backend user with any single CMS permission to act on template types outside their authorized scope. The CMS controller gated access to the section as a whole using OR-logic across its five permissions, but individual handlers such as onSave(), onDelete(), and onDeleteTemplates() did not verify that the user held the specific permission for the requested template type, so a user with only cms.manage_pages could craft AJAX requests to delete layouts, modify partials, or read content files. Separately, the AssetList widget was registered for any user who passed the controller gate regardless of the cms.manage_assets permission, and its onUpload() handler omitted the theme-validation call present on the other mutating handlers, permitting unauthorized file uploads into the active theme's asset directory. Exploitation requires an authenticated backend account holding at least one of the CMS Theme Editor permissions. This issue is fixed in version 1.2.13.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

EPSS: 0.002790000 probability, percentile 0.198830000 (date 2026-08-27)

Problem Types: CWE-289 | CWE-289 CWE-289: Authentication Bypass by Alternate Name

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wintercms Winter affected < 1.2.13 Not specified

References

ReferenceSourceLinkTags
github.com/wintercms/winter/security/advisories/GHSA-5c4f-9pq9-6c77 [email protected] github.com
github.com/wintercms/winter/releases/tag/v1.2.13 [email protected] github.com
github.com/wintercms/winter/commit/164c62524e8abc153d09c6c35916278bdb746a2b [email protected] github.com
github.com/wintercms/winter/commit/5391afa242eba3c476869035b7492e50a262c46b [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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