HashBrownCMS HashBrown CMS up to 1.4.6 Media Upload Thumbnail Generation Media.js Media.generateThumbnail os command injection

Summaryinfo

A vulnerability was found in HashBrownCMS HashBrown CMS up to 1.4.6. It has been declared as critical. This vulnerability affects the function Media.generateThumbnail of the file src/Server/Entity/Resource/Media.js of the component Media Upload Thumbnail Generation. The manipulation results in os command injection. This vulnerability is known as CVE-2026-70374. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in HashBrownCMS HashBrown CMS up to 1.4.6. It has been classified as critical. Affected is the function Media.generateThumbnail of the file src/Server/Entity/Resource/Media.js of the component Media Upload Thumbnail Generation. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

HashBrown CMS through 1.4.6 contains an OS Command Injection vulnerability (CWE-78) in the media upload thumbnail generation routine. Media.generateThumbnail() in src/Server/Entity/Resource/Media.js builds a temporary file path as 'thumbnail' + Path.extname(filename) and passes it, unescaped, into a shell command executed via AppService.exec() ('convert ' + tempFile + ...). The MIME-type filter in getMIMEType() (src/Common/utilities.js) truncates the extracted extension at the first '?' character, while Path.extname() does not, allowing a filename such as 'x.jpg?$(command)' to pass the image-type check while still injecting a shell command substitution into the exec() call. An authenticated user holding the media resource scope can achieve arbitrary OS command execution in the context of the Node.js process via POST /api/{project}/{environment}/media/new.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-70374 since 08/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/05/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Content Management System

Vendor

• HashBrownCMS

Name

• HashBrown CMS

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6

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