Is CVE-2026-125339 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-125339 being exploited in the wild.

How severe is CVE-2026-125339?

Medium severity, with a CVSS score of 6.1, published 10 November 2026.

Is there a fix for CVE-2026-125339?

Yes: fixed in 1.2.14. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-125339 attacked?

It is attacked over the network.

Am I affected by CVE-2026-125339?

Check whether you run Winter CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-125339: Winter CMS CSRF via unvalidated backend handler invocation

CVE-2026-125339 · Severity: medium · CVSS 6.1 · Published 2026-11-10

Winter CMS is a content management system built on Laravel. The backend controller accepts GET requests to invoke state-changing AJAX handlers without CSRF token validation, allowing an attacker to trick an authenticated admin into visiting a malicious link that performs unauthorized actions like truncating logs, resetting settings, or deleting templates. An unauthenticated attacker can exploit this by inducing a logged-in backend user to click a link that modifies the system.

Technologies: Winter CMS. Vendors: Winter CMS.

Quick answers

Is CVE-2026-125339 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-125339 being exploited in the wild.
How severe is CVE-2026-125339?: Medium severity, with a CVSS score of 6.1, published 10 November 2026.
Which products and versions are affected?: Winter CMS 1.0.319 to 1.2.13.
Is there a fix for CVE-2026-125339?: Yes: fixed in 1.2.14. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-125339 attacked?: It is attacked over the network.
Am I affected by CVE-2026-125339?: Check whether you run Winter CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 1.2.14

Technical details

The vulnerability exists in Backend\Classes\Controller::actionExists(), which accepts public handler-shaped methods as page actions without case-sensitivity validation. Because backend routes use Route::any(), CSRF validation skips GET requests, and the default SameSite=Lax cookie is sent cross-site, an attacker can craft a URL like /backend/system/eventlogs/index_onEmptyLog to invoke index_onEmptyLog() without a CSRF token. The fix in v1.2.14 enforces lowercase-only action method names and normalizes dashed URLs to snake_case, blocking the case-insensitive bypass.

Affected products

Winter CMS Winter CMS 1.0.319 to 1.2.13

Timeline

2026-11-10: disclosed
2026-08-19: patched: v1.2.14 released with security hardening

References

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