# CVE-2026-125337: Winter CMS: ImportExportController AJAX handlers bypass granular import/export permission gate

Status: published. Published: 2026-11-10. Updated: 2026-11-10.

Winter CMS is a content management system built on the Laravel PHP framework. Prior to 1.2.14, the ImportExportController behavior applies userHasAccess() only to the import() and export() page actions, while Backend\Classes\Controller::execAjaxHandlers() dispatches onImport(), onImportLoadForm(), onImportLoadColumnSampleForm(), onExport(), and onExportLoadForm() before those gated actions run, and the separately reachable download() action also lacks the granular export check. An authenticated backend user with a valid session and coarse access through $requiredPermissions, but without the configured import[permissions] or export[permissions], can use the import handlers to write or overwrite records and can use onExport() followed by download() to retrieve the complete dataset exposed by the export model. Controllers without granular permission keys are unaffected because userHasAccess() is intentionally default-permissive. This issue is fixed in version 1.2.14.

## Remediation

- fix: winter/wn-backend-module (Packagist): OSV reports a fixed version 1.2.14. Check the advisory for supported release branches. (source: OSV GHSA-fm29-4mq3-phg6) — https://github.com/advisories/GHSA-fm29-4mq3-phg6

## Affected products and versions

- wintercms / winter: < 1.2.14 (affected). Source: CNA: GitHub_M
-  / winter/wn-backend-module (winter/wn-backend-module): v1.0.473 (affected, Packagist); v1.0.474 (affected, Packagist); v1.0.475 (affected, Packagist); v1.1.10 (affected, Packagist); v1.1.11 (affected, Packagist); v1.1.2 (affected, Packagist); v1.1.3 (affected, Packagist); v1.1.4 (affected, Packagist); v1.1.5 (affected, Packagist); v1.1.6 (affected, Packagist); v1.1.7 (affected, Packagist); v1.1.8 (affected, Packagist); v1.1.9 (affected, Packagist); v1.2.0 (affected, Packagist); v1.2.1 (affected, Packagist); v1.2.10 (affected, Packagist); v1.2.11 (affected, Packagist); v1.2.12 (affected, Packagist); v1.2.13 (affected, Packagist); v1.2.2 (affected, Packagist); v1.2.3 (affected, Packagist); v1.2.4 (affected, Packagist); v1.2.5 (affected, Packagist); v1.2.6 (affected, Packagist); v1.2.7 (affected, Packagist); v1.2.8 (affected, Packagist); v1.2.9 (affected, Packagist); Ecosystem version events: introduced 0; fixed 1.2.14. Source: OSV GHSA-fm29-4mq3-phg6

## Severity and prioritization

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-862, CWE-863

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/wintercms/winter/security/advisories/GHSA-fm29-4mq3-phg6 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/wintercms/winter/commit/84c81f153f2dc3e2c7b03ab14a4a3ca8456d0e4f (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/wintercms/winter/releases/tag/v1.2.14 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/advisories/GHSA-fm29-4mq3-phg6 (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-fm29-4mq3-phg6 (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-125337; retrieved 2026-11-10; source updated 2026-11-10

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-fm29-4mq3-phg6; retrieved 2026-11-10; source updated 2026-11-10

Revision: c381d7df9f7ea8768290518d87f88647518e6dd7f761e60d1e19eba997499c82

Canonical: https://y2.dev/cve/CVE-2026-125337

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