Answer in brief
CVE-2026-125339 records a Medium severity (CVSS 6.1) vulnerability in Winter CMS: CSRF through AJAX handler names reachable as backend page actions. The current sources do not mark it as known exploited. The current feed maps winter/wn-backend-module (composer), wintercms/winter (generic), winter/wn-backend-module (packagist). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps winter/wn-backend-module (composer), wintercms/winter (generic), winter/wn-backend-module (packagist). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| winter/wn-backend-modulecomposer | >=1.0.319,<1.2.14 | 1.2.14 |
| wintercms/wintergeneric | >=1.0.319 <1.2.14 | 1.2.14 |
| winter/wn-backend-modulepackagist | >=1.0.319 <1.2.14 | 1.2.14 |
Published upstream
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 20, 2026
Winter CMS is a content management system built on the Laravel PHP framework. From 1.0.319 until 1.2.14, Backend\Classes\Controller::actionExists() accepts public handler-shaped methods as page actions, so a top-level GET request can invoke state-changing backend AJAX handlers without a CSRF token. Because backend routes use Route::any, CSRF validation skips GET, and the default SameSite=Lax session cookie is sent on cross-site navigation, an unauthenticated attacker can induce an authorized backend user to follow a link such as /backend/system/eventlogs/index_onEmptyLog. Affected handlers in the backend, CMS, and system modules can truncate logs, reset settings, alter backend user state, or delete CMS templates, while URL path segments can select a target record. This issue is fixed in version 1.2.14.
Quoted source text, attributed separately from HOL analysis.