Bypass of fix for CVE-2020-15247, Twig sandbox escape
Description
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. 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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
october/cmsPackagist | >= 1.0.469, < 1.0.470 | 1.0.470 |
Affected products
1- Range: = 1.0.469
Patches
1d34fb8ab5110Improve Twig security policy
1 file changed · +2 −0
modules/system/twig/SecurityPolicy.php+2 −0 modified@@ -20,6 +20,8 @@ final class SecurityPolicy implements SecurityPolicyInterface protected $blockedMethods = [ 'addDynamicMethod', 'addDynamicProperty', + 'bindEvent', + 'bindEventOnce', ]; /**
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-94vp-rmqv-5875ghsaADVISORY
- github.com/advisories/GHSA-r89v-cgv7-3jhxghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-26231ghsaADVISORY
- github.com/octobercms/october/commit/d34fb8ab51108495a9a651b841202d935f4e12f7ghsax_refsource_MISCWEB
- github.com/octobercms/october/security/advisories/GHSA-r89v-cgv7-3jhxghsax_refsource_CONFIRMWEB
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