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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXI4OXYtY2d2Ny0zamh4

Bypass of fix for CVE-2020-15247, Twig sandbox escape


A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as CVE-2020-15247:

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.


Issue has been patched in Build 470 (v1.0.470) and v1.1.1.


Apply to your installation manually if unable to upgrade to Build 470 or v1.1.1.


Reported by ka1n4t

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Threat assessment:

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: almost 3 years ago
Updated: 9 months ago

CVSS Score: 5.2
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

Identifiers: GHSA-r89v-cgv7-3jhx, CVE-2020-26231

Affected Packages

Versions: = 1.0.469
Fixed in: 1.0.470