# Winter CMS Backend Module vulnerabilities

Source: https://junglewise.ai/threats/technologies/backend-module  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/backend-module.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in Winter CMS Backend Module: 0 in the last 7 days and 5 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-54256, was published on 26 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 5
- All time: 5 (0 critical, 0 exploited in the wild)

## Latest Winter CMS Backend Module vulnerabilities

- [CVE-2026-54256: Winter CMS FileUpload widget IDOR in attachment metadata](https://junglewise.ai/threats/cve-2026-54256-winter-cms-fileupload-widget-idor-in-attachment-metadata) (medium, CVSS 5.4, published 26 Aug 2026)
- [CVE-2026-35445: Winter CMS authorization bypass in Users controller](https://junglewise.ai/threats/cve-2026-35445-winter-cms-authorization-bypass-in-users-controller) (high, CVSS 4, published 26 Aug 2026)
- [CVE-2026-32258: Winter CMS stored XSS in Editor Settings custom styles](https://junglewise.ai/threats/cve-2026-32258-winter-cms-stored-xss-in-editor-settings-custom-styles) (high, CVSS 8.1, published 26 Aug 2026)
- [Winter CMS ImportExportController AJAX handlers permission bypass](https://junglewise.ai/threats/winter-cms-importexportcontroller-ajax-handlers-permission-bypass-ac8bbb08) (high, CVSS 8.3, published 20 Aug 2026)
- [Winter Backend List widget stored XSS in image columns](https://junglewise.ai/threats/winter-backend-list-widget-stored-xss-in-image-columns-e56efd1b) (low, CVSS 2, published 20 Aug 2026)

## Most severe Winter CMS Backend Module vulnerabilities

- [Winter CMS ImportExportController AJAX handlers permission bypass](https://junglewise.ai/threats/winter-cms-importexportcontroller-ajax-handlers-permission-bypass-ac8bbb08) (high, CVSS 8.3, published 20 Aug 2026)
- [CVE-2026-32258: Winter CMS stored XSS in Editor Settings custom styles](https://junglewise.ai/threats/cve-2026-32258-winter-cms-stored-xss-in-editor-settings-custom-styles) (high, CVSS 8.1, published 26 Aug 2026)
- [CVE-2026-35445: Winter CMS authorization bypass in Users controller](https://junglewise.ai/threats/cve-2026-35445-winter-cms-authorization-bypass-in-users-controller) (high, CVSS 4, published 26 Aug 2026)
- [CVE-2026-54256: Winter CMS FileUpload widget IDOR in attachment metadata](https://junglewise.ai/threats/cve-2026-54256-winter-cms-fileupload-widget-idor-in-attachment-metadata) (medium, CVSS 5.4, published 26 Aug 2026)
- [Winter Backend List widget stored XSS in image columns](https://junglewise.ai/threats/winter-backend-list-widget-stored-xss-in-image-columns-e56efd1b) (low, CVSS 2, published 20 Aug 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 2 | 0 | 0 |
| 24 Aug 2026 | 3 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Winter CMS technologies

- [Winter CMS](https://junglewise.ai/threats/technologies/winter-cms): 9 vulnerabilities
- [Winter CMS WN Backend Module](https://junglewise.ai/threats/technologies/wn-backend-module): 5 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Winter CMS Backend Module vulnerabilities", https://junglewise.ai/threats/technologies/backend-module, 11 November 2026.