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Advisories

CakePHP through 5.4.3 Email Header Injection via Bare CR/LF in SmtpTransport and MailTransport

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Severity
medium
Date
Affecting

  • cakephp >= 4.5.12, <= 4.5.12

  • cakephp >= 4.6.5, <= 4.6.5

  • cakephp >= 5.1.8, <= 5.1.10

  • cakephp >= 5.2.14, <= 5.2.15

  • cakephp >= 5.3.7, <= 5.3.7

  • cakephp >= 5.4.0, <= 5.4.3

CWE
  • CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSS
6.3
CVSS V4 Vector
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
Credit
Abraxas Labs, Mark Story
Description
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.

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