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Bypass of CMS Safe Mode Security FeatureGHSA-q37h-jhf3-85cj

GHSA-q37h-jhf3-85cj is a security vulnerability in wintercms/winter. A fix is available for wintercms/winter — see the affected versions and patch details below.

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Dec 8, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

2 pkgs affected
🐘wintercms/winter🐘wintercms/winter

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Authenticated users with permissions to create or modify theme template objects through the backend "CMS" editor can exploit this vulnerability to bypass the cms.enableSafeMode security feature if enabled (disables modification of PHP code through the web interface when enabled).

This is only an issue for Winter CMS instances that rely on the Safe Mode security feature to prevent privileged users from modifying the PHP code of CMS theme template objects through the web interface.

CVSS v3.1 Vector: AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Patches

Issue has been fixed in v1.0.475, v1.1.9, & v1.2.

Workarounds

Apply https://github.com/wintercms/storm/commit/03eb5ce3f2a271670574802b914f7bcaf07663c1 manually if unable to upgrade to v1.0.475, v1.1.9, or v1.2.0.

References

See https://github.com/octobercms/october/security/advisories/GHSA-79jw-2f46-wv22/.

Credit to David Miller for reporting the issue.

For more information

If you have any questions or comments about this advisory:

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistwintercms/winterall versions1.0.475composer require wintercms/winter:^1.0.475
🐘Packagistwintercms/winter≥ 1.1.0&&< 1.1.91.1.9composer require wintercms/winter:^1.1.9

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wintercms/winter, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update wintercms/winter to 1.0.475 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q37h-jhf3-85cj is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact Authenticated users with permissions to create or modify theme template objects through the backend "CMS" editor can exploit this vulnerability to bypass the `cms.enableSafeMode` security feature if enabled (disables modification of PHP code through the web interface when enabled). This is only an issue for Winter CMS instances that rely on the Safe Mode security feature to prevent privileged users from modifying the PHP code of CMS theme template objects through the web interface. CVSS v3.1 Vector: [AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C](https://nvd.nist.gov/vuln-met
O3 Security · Impact-Aware SCA

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Bypass of CMS Safe Mode Security Feature