CVE-2026-119415CakePHP through 5.4.3 MIME Header Injection via FormDataPart Content-Type

Description

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/cakephp/cakephp/commit/2e54c227eaa4c0e0d5edd74931710fd4f8bc38b5 patch
• https://github.com/cakephp/cakephp/commit/27263ae750a3cd8464a5db076f48a731c8283df2 patch
• https://github.com/cakephp/cakephp/commit/c9a91149f04e2aee7faa30ed57d40f5b91d3f79e patch
• https://github.com/cakephp/cakephp/commit/d66e016d2fd9667dd605b56e25fbb3df5365406a patch
• https://github.com/cakephp/cakephp/pull/19715 patchissue-tracking
• https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Http/Client/FormDataPart… technical-description
• https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Mailer/Message.php#L1181 technical-description
• https://abraxaslabs.tech/research/cakephp-attachment-crlf third-party-advisory
• https://github.com/cakephp/cakephp product
• VulnCheck Advisory: CakePHP through 5.4.3 MIME Header Injection via FormDataPart Content-Type third-party-advisory