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TI-2026-24786 Aliases CVE-2026-32257GHSA-v7cf-8gh9-gxmj

Winter: Stored XSS through Brand Settings custom styles

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.2.13, custom CSS supplied through the Brand Settings Styles field by a backend user with the backend.manage_branding permission is compiled by the LESS parser and rendered without sanitization on every backend page, allowing stored cross-site scripting against backend users. This issue is fixed in version 1.2.13.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00382 32nd percentileScored 2026-11-07
Fix Fixed winter (wintercms): 1.2.13winter/wn-backend-module (Packagist): 1.2.13

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
wintercmswinterbefore 1.2.131.2.13Patch availableCNA
—winter/wn-backend-module (Packagist)before 1.2.131.2.13Patch availableGHSA-v7cf-8gh9-gxmj
  • winter Vendorwintercms Affected before 1.2.13 Fixed in 1.2.13 Patch available CNA
  • winter/wn-backend-module (Packagist) Vendor— Affected before 1.2.13 Fixed in 1.2.13 Patch available GHSA-v7cf-8gh9-gxmj

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:*——wintercms
  • cpe:2.3:a:wintercms:winter:*:*:*:*:*:*:*:* Versions — — ·wintercms

Remediation

  • Fix · CNA winter (wintercms) Fixed in 1.2.13
  • Fix · GHSA-v7cf-8gh9-gxmj winter/wn-backend-module (Packagist) Fixed in 1.2.13 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-32257
  2. 2026-10-03 Alias added: GHSA-v7cf-8gh9-gxmj

References

Other 3

  • TI-2024-19497 Server-side Template Injection (SSTI) vulnerability in Winter CMS v.1.2.3 allows a remote… CVSS 3.1HIGH 7.2
  • TI-2023-28528 Winter CMS Local File Inclusion through Server Side Template Injection CVSS 3.1MEDIUM 5.4
  • TI-2022-18732 Winter vulnerable to Prototype Pollution in Snowboard framework CVSS 3.1CRITICAL 9.8
  • TI-2026-55251 Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy CVSS 4.0CRITICAL 9.3
  • TI-2026-21979 Winter: Privilege escalation by authenticated backend users CVSS 3.1CRITICAL 10.0
  • TI-2024-21102 Dusk plugin may allow unfettered user authentication in misconfigured installs CVSS 3.1HIGH 8.8
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences