High severity · published Aug 24, 2026
CVE-2026-77634
CakePHP: SmtpTransport vulnerable to CRLF header injection
8.2
CVSS
0.5%
EPSS
No
On KEV
Description
CakePHP is a rapid development framework for PHP. Prior to versions 4.5.12, 4.6.5, 5.1.8, 5.2.14, and 5.3.7 on their respective release lines, custom mail headers added with Message::setHeaders() or Message::addHeaders() do not have CRLF bytes removed, allowing header injection when user-controlled data is used in message headers. This issue is fixed in versions 4.5.12, 4.6.5, 5.1.8, 5.2.14, and 5.3.7.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
cakephp · cakephp
>= 4.5.0, < 4.5.12; >= 4.6.0, < 4.6.5; >= 5.0.0, < 5.1.9; >= 5.2.0, < 5.2.14; >= 5.3.0, < 5.3.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77634
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77634
github.com
https://github.com/cakephp/cakephp/commit/08188962bcd99a95da1e49f62e786f2d688f1e41
github.com
https://github.com/cakephp/cakephp/commit/2afe42b02d8ddc5d442bca5e8bb61910a727646e
github.com
https://github.com/cakephp/cakephp/commit/3e09dae6cbdc983754fa3a8e6aae74da102a3ea1
github.com
https://github.com/cakephp/cakephp/commit/b67b622457362b075bb37e625a82af73a0b3c9c3
github.com
https://github.com/cakephp/cakephp/security/advisories/GHSA-2qh5-382h-3jpc
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