Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled.
Impact
An authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.
This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.
Patches
Issue has been patched in Build 469 (v1.0.469) and v1.1.0.
Workarounds
Apply https://github.com/octobercms/october/compare/106daa2930de4cebb18732732d47d4056f01dd5b...7cb148c1677373ac30ccfd3069d18098e403e1ca to your installation manually if unable to upgrade to Build 469.
References
Reported by ka1n4t
For more information
If you have any questions or comments about this advisory:
- Email us at hello@octobercms.com
Threat assessment:
<img width="1108" alt="Screen Shot 2020-10-10 at 1 21 13 PM" src="https://user-images.githubusercontent.com/7253840/95663316-7de28b80-0afb-11eb-999d-a6526cf78709.png">Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | october/cms | >= 1.0.319, < 1.0.469 | 1.0.469 |
References
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L- Weakness (CWE)
CWE-862- Platform
- Composer
- Package
october/cms- Disclosed
- 23.11.2020
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-94vp-rmqv-5875 - CC BY 4.0
Vulnerability history: october/cms
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 06.2020 05.2022
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 4
- Low 2
Disclosures per year
- 2020: 6
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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Twig Sandbox Escape by authenticated users with access to editing CMS templates when safemode is enabled. this entry
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