CakePHP up to 5.4.3 FormDataPart Message::setAttachments Content-Type/Content-ID injection

Summaryinfo

A vulnerability categorized as problematic has been discovered in CakePHP up to 5.4.3. The impacted element is the function Message::setAttachments of the component FormDataPart. Such manipulation of the argument Content-Type/Content-ID leads to injection. This vulnerability is documented as CVE-2026-119415. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in CakePHP up to 5.4.3. Affected by this issue is the function Message::setAttachments of the component FormDataPart. The manipulation of the argument Content-Type/Content-ID with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is integrity. CVE summarizes:

CakePHP through 5.4.3 contains a header injection vulnerability in FormDataPart that allows attackers to inject MIME part headers via unsanitized Content-Type and Content-ID values. Attackers can supply CR/LF sequences in attachment MIME types or Content-IDs passed to Message::setAttachments() or HTTP client multipart data to add arbitrary headers or content.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-119415 since 10/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/30/2026). The MITRE ATT&CK project declares the attack technique as T1055.

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• CakePHP

Version

• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3

Website

• Product: https://github.com/cakephp/cakephp/

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