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Vulnerability record · CVE-2017-16941 · published 25 November 2017

CVE-2017-16941: Octobercms october unrestricted file upload vulnerability

Octobercms · October

October CMS through 1.0.428 does not prevent use of .htaccess in themes, which allows remote authenticated users to execute arbitrary PHP code by downloading a theme ZIP archive from /backend/cms/themes, and then uploading and importing a modified archive with two new files: a .php file and a .htaccess file. NOTE: the vendor says "I don't think [an attacker able to login to the system under an account that has access to manage/upload themes] is a threat model that we need to be considering.

8.8 CVSS 3.0 High EPSS 1.6% · top 25.8% CWE-434 · Unrestricted file upload
8.8CVSS 3.0 base score, v2 6.5
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

October CMS through 1.0.428 does not prevent use of .htaccess in themes, which allows remote authenticated users to execute arbitrary PHP code by downloading a theme ZIP archive from /backend/cms/themes, and then uploading and importing a modified archive with two new files: a .php file and a .htaccess file. NOTE: the vendor says "I don't think [an attacker able to login to the system under an account that has access to manage/upload themes] is a threat model that we need to be considering.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/octobercms/october/issues/3257 Issue TrackingThird Party Advisory
https://github.com/octobercms/october/issues/3257 Issue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2021-32648October CMS password reset authentication bypassOctober CMS, a Laravel-based CMS, contains an improper authentication flaw in the october/system package. An attacker can request an account password…KEVEPSS 90%analysed9.8CVE-2021-3311Octobercms october insufficient session expiration vulnerabilityAn issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occur…EPSS 2.9%9.8CVE-2017-1000194Octobercms october unrestricted file upload vulnerabilityOctober CMS build 412 is vulnerable to Apache configuration modification via file upload functionality resulting in site compromise and possibly othe…EPSS 1.2%9.8CVE-2017-1000196Octobercms october code injection vulnerabilityOctober CMS build 412 is vulnerable to PHP code execution in the asset manager functionality resulting in site compromise and possibly other applicat…EPSS 1.9%9.8CVE-2017-1000197Octobercms october vulnerabilityOctober CMS build 412 is vulnerable to file path modification in asset move functionality resulting in creating creating malicious files on the serve…EPSS 1.2%9.1CVE-2023-44382Octobercms october code injection vulnerabilityOctober is a Content Management System (CMS) and web platform to assist with development workflow. An authenticated backend user with the `editor.cms…EPSS 0.87%8.8CVE-2021-32649Octobercms october injection vulnerabilityOctober CMS is a self-hosted content management system (CMS) platform based on the Laravel PHP Framework. Prior to versions 1.0.473 and 1.1.6, an att…EPSS 1.3%8.8CVE-2021-32650Octobercms october injection vulnerabilityOctober CMS is a self-hosted content management system (CMS) platform based on the Laravel PHP Framework. Prior to versions 1.0.473 and 1.1.6, an att…EPSS 2.1%

Source: NIST National Vulnerability Database (record CVE-2017-16941), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.