CVE-2021-41126— Deleted Admin Can Sign In to Admin Interface
Quick assessment
Affected
octobercms october
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 存在授权问题漏洞，之前已被删除的管理员帐户可能仍然能够使用 October CMS v2.0 登录到后端。
Possible ATT&CK Techniques 1 AI
T1078 · Valid Accounts
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I. Basic Information for CVE-2021-41126
Vulnerability Information
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Vulnerability Title
Deleted Admin Can Sign In to Admin Interface
Source: CVE Program / CVE List V5
Vulnerability Description
October is a Content Management System (CMS) and web platform built on the the Laravel PHP Framework. In affected versions administrator accounts which had previously been deleted may still be able to sign in to the backend using October CMS v2.0. The issue has been patched in v2.1.12 of the october/october package. There are no workarounds for this issue and all users should update.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
October CMS 授权问题漏洞
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 存在授权问题漏洞，之前已被删除的管理员帐户可能仍然能够使用 October CMS v2.0 登录到后端。
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 | >= 2.0.0, < 2.1.12 | - |
|
II. Public POCs for CVE-2021-41126
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-41126 (1)
-
https://github.com/octobercms/october/security/advisories/GHSA-6gjf-7w99-j7x7 x_refsource_CONFIRM
Other References for CVE-2021-41126 (1)
-
https://octobercms.com/changelog x_refsource_MISC
IV. Related Vulnerabilities
Same product: october
-
CVE-2026-49400
October CMS: PHP Object Injection via Backend Widget Session -
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
Same vendor: octobercms
-
CVE-2026-49400
October CMS: PHP Object Injection via Backend Widget Session -
CVE-2026-46696
October CMS: Safe Mode Sandbox Bypass via Session Store and -
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
Same weakness: CWE-287
-
CVE-2026-109082
Keycloak-services: keycloak-services: ciba confidential-only -
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AmoyLab Unla through 0.10.0 OAuth2 Authentication Bypass via -
CVE-2026-108522
Studio-Saelix Sencho Login Endpoint login improper authentic -
CVE-2026-108707
Wukong_HRM through commit 186115e Authentication Bypass via -
CVE-2026-108548
AstronRPA through 1.1.6 Authentication Bypass via Arbitrary
V. Comments for CVE-2021-41126
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