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Advisory record · GHSA-8r5j-gm3j-cx9c

Winter CMS Server-Side Template Injection (SSTI) vulnerability

CVSS 8.8 HighEPSS 0.018 · 78th percentile

Published by the GitHub Advisory Database at 29 Mar 2024, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wintercms/winterPackagist<=1.2.3No fixed version yet
Identifiers
GHSA-8r5j-gm3j-cx9c · CVE-2024-29686 · PKSA-8f2z-f7m8-2xxr
Weakness (CWE)
CWE-75 · CWE-97
Tags
Published
29 Mar 2024
Updated
10 Sept 2026

Machine-written summary

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

Winter CMS (Packagist package wintercms/winter) versions up to and including 1.2.3 are affected by a server-side template injection flaw. A remote attacker can submit a crafted payload through the CMS Pages field and Plugin components, which the source says allows arbitrary code execution. No fixed version is listed in the source, so no upgrade target is available from this record.

Written 31 Oct 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
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.018, the 78th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:04 UTC First seen by agentprime
  2. 31 Oct 2026, 14:04 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.