CVE-2020-26231— Bypass of fix for CVE-2020-15247, Twig sandbox escape
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I. Basic Information for CVE-2020-26231
Vulnerability Information
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Vulnerability Title
Bypass of fix for CVE-2020-15247, Twig sandbox escape
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
October CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
October CMS是一套基于PHP和Laravel Web应用程序框架的开源内容管理系统（CMS）。 October CMS (v1.0.470)之前版本和v1.1.1之前版本存在安全漏洞，该漏洞源于启用的enableSafeMode能够编写特定的Twig代码来逃避Twig沙箱并执行任意的PHP。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| octobercms | october | = 1.0.469 | - |
II. Public POCs for CVE-2020-26231
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · octobercms · 2020-11-23 · 5 CVEs total
| CVE-2020-15246 | 7.5 HIGH | Local File Inclusion by unauthenticated users |
| CVE-2020-15247 | 5.2 MEDIUM | Twig Sandbox Escape by authenticated users with access to editing CMS templates when safem |
| CVE-2020-15248 | 4.0 MEDIUM | Privilege escalation by backend users assigned to the default "Publisher" system role |
| CVE-2020-15249 | 2.8 LOW | Stored XSS by authenticated backend user with access to upload files |
IV. Related Vulnerabilities
Same product: october
- CVE-2026-29179
October: Editor Sub-Permission Bypass for Asset and Blueprin - CVE-2026-27937
October: Reflected XSS via DataTable Form Widget - CVE-2026-26274
October: Safe Mode Bypass via Twig Database Write Operations - CVE-2026-26067
October: Safe Mode Bypass via CSS Preprocessor Compilers - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass
Same vendor: octobercms
- CVE-2026-29179
October: Editor Sub-Permission Bypass for Asset and Blueprin - CVE-2026-27937
October: Reflected XSS via DataTable Form Widget - CVE-2026-26274
October: Safe Mode Bypass via Twig Database Write Operations - CVE-2026-26067
October: Safe Mode Bypass via CSS Preprocessor Compilers - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass
Same weakness: CWE-862
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