Published on: 05/03/2021 12:00:00 AM UTC

Last Modified on: 05/03/2021 05:37:00 PM UTC

CVE-2021-21264 - advisory for GHSA-fcr8-6q7r-m4wg

Source: Mitre Source: Nist Print: PDF PDF

Certain versions of October from Octobercms contain the following vulnerability:

October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-26231 (fixed in 1.0.470/471 and 1.1.1) was discovered that has the same impact as CVE-2020-26231 & 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 472 (v1.0.472) and v1.1.2. As a workaround, apply to your installation manually if unable to upgrade to Build 472 or v1.1.2.

  • CVE-2021-21264 has been assigned by URL Logo [email protected] to track the vulnerability
  • Affected Vendor/Software: URL Logo octobercms - october version 1.0.471
  • Affected Vendor/Software: URL Logo octobercms - october version 1.1.1

CVE References

Description Tags Link
Bypass of fix for CVE-2020-26231, Twig sandbox escape · Advisory · octobercms/october · GitHub

Known Affected Software

Vendor Product Version
Octobercms october 1.0.471
Octobercms october 1.1.1

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-21264 : October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A by…… 2021-05-03 16:06:28
Reddit Logo Icon /r/netcve CVE-2021-21264 2021-05-03 16:41:24
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