CakePHP up to 5.3.6 Message Message::setHeaders crlf injection

Summaryinfo

A vulnerability classified as critical has been found in CakePHP up to 4.5.11/4.6.4/5.1.7/5.2.13/5.3.6. This issue affects the function Message::setHeaders of the component Message. Performing a manipulation results in crlf injection. This vulnerability is reported as CVE-2026-77634. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in CakePHP up to 4.5.11/4.6.4/5.1.7/5.2.13/5.3.6. It has been classified as critical. This affects the function Message::setHeaders of the component Message. The manipulation with an unknown input leads to a crlf injection vulnerability. CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-77634 since 08/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.5.12, 4.6.5, 5.1.8, 5.2.14 or 5.3.7 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• CakePHP

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3
• 4.6.4
• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4
• 5.1.5
• 5.1.6
• 5.1.7
• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.7
• 5.2.8
• 5.2.9
• 5.2.10
• 5.2.11
• 5.2.12
• 5.2.13
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6

Website

• Product: https://github.com/cakephp/cakephp/

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