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Fencer Intel
medium 4.5

CVE-2026-125340 json

Winter CMS: Reflected XSS through the search query parameter in the backend Table widget

published 2mo ago modified yesterday also GHSA-hq84-x37p-j6q5 , EUVD-2026-122898

cvss
4.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Winter CMS is a content management system built on the Laravel PHP framework. From 1.0.420 until 1.2.14, the backend Table widget partial modules/backend/widgets/table/partials/_table.php emits the search query parameter without HTML encoding inside a script template. A script-closing sequence in a crafted top-level GET URL terminates the raw-text template and causes the remaining input to be parsed as backend markup, even when the widget uses searching: false. Any Table or DataTable page is a sink, including the core Editor Settings route /backend/system/settings/update/winter/backend/editor, and an unauthenticated attacker can induce an authorized backend user to follow the link. Script executing in the victim's backend origin can read the CSRF token and issue credentialed requests with that user's permissions. For the core sink, a victim with backend.manage_editor, normally a Developer-role user or superuser, can edit CMS templates, so the injected script can conditionally chain to server-side code execution; this does not grant permissions the victim lacks and does not apply automatically to every third-party plugin sink. This issue is fixed in version 1.2.14.

Patch / fix

  • packagist winter/wn-backend-module 1.2.14

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Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 4.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
GitHub 3.1 4.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist winter/wn-backend-module
>=1.0.420, <1.2.14
1.2.14

Affected products

  • wintercms winter

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.