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

Status: published. Published: 2026-10-30. Updated: 2026-11-04.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cakephp/cakephp/commit/2e54c227eaa4c0e0d5edd74931710fd4f8bc38b5
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cakephp/cakephp/commit/27263ae750a3cd8464a5db076f48a731c8283df2
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cakephp/cakephp/commit/c9a91149f04e2aee7faa30ed57d40f5b91d3f79e
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cakephp/cakephp/commit/d66e016d2fd9667dd605b56e25fbb3df5365406a
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/cakephp/cakephp/pull/19715

## Affected products and versions

- cakephp / cakephp (cakephp/cakephp): ≥ 0; ≤ 5.4.3 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.7 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.37% as of 2026-11-03; percentile 31.00%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-93

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/cakephp/cakephp/commit/2e54c227eaa4c0e0d5edd74931710fd4f8bc38b5 (CNA: VulnCheck; patch)

- https://github.com/cakephp/cakephp/commit/27263ae750a3cd8464a5db076f48a731c8283df2 (CNA: VulnCheck; patch)

- https://github.com/cakephp/cakephp/commit/c9a91149f04e2aee7faa30ed57d40f5b91d3f79e (CNA: VulnCheck; patch)

- https://github.com/cakephp/cakephp/commit/d66e016d2fd9667dd605b56e25fbb3df5365406a (CNA: VulnCheck; patch)

- https://github.com/cakephp/cakephp/pull/19715 (CNA: VulnCheck; patch, issue-tracking)

- https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Http/Client/FormDataPart.php#L200 (CNA: VulnCheck; technical-description)

- https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Mailer/Message.php#L1181 (CNA: VulnCheck; technical-description)

- https://abraxaslabs.tech/research/cakephp-attachment-crlf (CNA: VulnCheck; third-party-advisory)

- https://github.com/cakephp/cakephp (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/cakephp-through-5.4.3-mime-header-injection-via-formdatapart-content-type (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-119415; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-119415; retrieved 2026-11-04; source updated Not reported

Revision: 28e4a564e7055ff645747946c1e535819a0f597140e3113b61a314c37fa7abe5

Canonical: https://y2.dev/cve/CVE-2026-119415

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