OctoberCMS up to 4.1.19/4.2.25/4.3.4 ResizeImages.php getSourcePathForResize realSourcePath server-side request forgery

Summaryinfo

A vulnerability marked as critical has been reported in OctoberCMS up to 4.1.19/4.2.25/4.3.4. This affects the function getSourcePathForResize of the file modules/system/classes/ResizeImages.php. This manipulation of the argument realSourcePath causes server-side request forgery. The identification of this vulnerability is CVE-2026-100909. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in OctoberCMS up to 4.1.19/4.2.25/4.3.4. Affected by this vulnerability is the function getSourcePathForResize of the file modules/system/classes/ResizeImages.php. The manipulation of the argument realSourcePath with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-100909. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. By approaching the search of inurl:modules/system/classes/ResizeImages.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.3.5 or 4.4.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• OctoberCMS

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.1.11
• 4.1.12
• 4.1.13
• 4.1.14
• 4.1.15
• 4.1.16
• 4.1.17
• 4.1.18
• 4.1.19
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.2.7
• 4.2.8
• 4.2.9
• 4.2.10
• 4.2.11
• 4.2.12
• 4.2.13
• 4.2.14
• 4.2.15
• 4.2.16
• 4.2.17
• 4.2.18
• 4.2.19
• 4.2.20
• 4.2.21
• 4.2.22
• 4.2.23
• 4.2.24
• 4.2.25
• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3
• 4.3.4

License

• open-source

CPE 2.3info

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CPE 2.2info

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Submitinfo

Accepted

• Submit #919993: octobercms October CMS <= 4.3.4 Path Traversal (by chenhuanlin)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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