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Advisory record · GHSA-p2ch-c2c3-4xm5

Winter: CSRF through AJAX handler names reachable as backend page actions

CVSS 6.1 Medium

Published by the GitHub Advisory Database at 20 Aug 2026, 18:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
winter/wn-backend-modulePackagist>=1.0.319, <1.2.141.2.14
Identifiers
GHSA-p2ch-c2c3-4xm5 · PKSA-r35b-91gt-bn2p
Weakness (CWE)
CWE-352
Tags
Published
20 Aug 2026
Updated
20 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Winter CMS's wn-backend-module, versions 1.0.319 up to 1.2.14 (not including 1.2.14), lets a backend AJAX handler run through a plain GET navigation with no CSRF token. An attacker can get an authenticated backend user with the relevant permission to follow a link, which then truncates the system event log, resets settings, alters backend user state, or deletes CMS templates. Upgrade to 1.2.14. Plugins with camelCase page actions must rename those methods to lowercase snake_case after upgrading.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.1 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.