CakePHP 4.5.12, 4.6.5, 5.1.8 through 5.1.10, 5.2.14 through 5.2.15, 5.3.7, and 5.4.0 through 5.4.3 contain an email header injection…
CVE-2026-119417
CakePHP 4.5.12, 4.6.5, 5.1.8 through 5.1.10, 5.2.14 through 5.2.15, 5.3.7, and 5.4.0 through 5.4.3 contain an email header injection vulnerability because SmtpTransport and MailTransport strip only CRLF pairs from header values, an incomplete fix for CVE-2026-77634. Attackers controlling custom headers set via Message::setHeaders() or Message::addHeaders() can insert a bare CR or LF to inject headers like Bcc, redirecting or altering outgoing mail.
Assessment
- CVSS
- 6.3 (v4.0)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 30 October 2026
- Last updated
- 30 October 2026
- Weakness
- CWE-93
- Assigner
- disclosure@vulncheck.com
CVSS vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
At the source
References
- https://abraxaslabs.tech/research/cakephp-smtp-crlf
- https://github.com/cakephp/cakephp
- https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Mailer/Transport/MailTransport.php#L57
- https://github.com/cakephp/cakephp/blob/6f3dd91371ac0698b64024ddb21d57def9fbba91/src/Mailer/Transport/SmtpTransport.php#L574
- https://github.com/cakephp/cakephp/commit/2b9326ca3f17b2e940c6c9f50d821e9929c00f39
- https://github.com/cakephp/cakephp/commit/3b997318539c48a423b77651c61c9f229cbf9e33
- https://github.com/cakephp/cakephp/commit/773587406a29eedc2e0031e12683b08e112cc538
- https://github.com/cakephp/cakephp/commit/e5936b286cc389b1497fd9b675a2133ba9ac557d
- https://github.com/cakephp/cakephp/pull/19695
- https://github.com/cakephp/cakephp/security/advisories/GHSA-2qh5-382h-3jpc
- https://www.vulncheck.com/advisories/cakephp-through-5.4.3-email-header-injection-via-bare-cr-lf-in-smtptransport-and-mailtransport
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