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CVE-2026-77634— CakePHP: SmtpTransport vulnerable to CRLF header injection

Quick assessment

Affected
cakephp cakephp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

cakephp是cakephp团队开源的一款PHP开发框架。 cakephp 4.5.12之前版本、4.6.5之前版本、5.1.8之前版本、5.2.14之前版本和5.3.7之前版本存在输入验证错误漏洞，该漏洞源于通过Message::setHeaders()或Message::addHeaders()方法添加的自定义邮件头未清除CRLF字节，当用户可控数据用于邮件头时，可能导致邮件头注入攻击。

CVSS 8.2 · High EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 5

VendorProduct Version RangeStatus
cakephp cakephp >= 4.5.0, < 4.5.12 affected
>= 4.6.0, < 4.6.5 affected
>= 5.0.0, < 5.1.9 affected
>= 5.2.0, < 5.2.14 affected
>= 5.3.0, < 5.3.7 affected
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I. Basic Information for CVE-2026-77634

Vulnerability Information
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Vulnerability Title
CakePHP: SmtpTransport vulnerable to CRLF header injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
cakephp 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cakephp是cakephp团队开源的一款PHP开发框架。 cakephp 4.5.12之前版本、4.6.5之前版本、5.1.8之前版本、5.2.14之前版本和5.3.7之前版本存在输入验证错误漏洞，该漏洞源于通过Message::setHeaders()或Message::addHeaders()方法添加的自定义邮件头未清除CRLF字节，当用户可控数据用于邮件头时，可能导致邮件头注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cakephp cakephp >= 4.5.0, < 4.5.12 -

II. Public POCs for CVE-2026-77634

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: CRLF header injection confirmed — the injected line "X-Injected: pwned" was observed on the SMTP wire; custom header value carried PROOF_9dbbc173900cd059
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 6962 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-77634

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Patches & Fixes for CVE-2026-77634 (4)

Vendor Advisories for CVE-2026-77634 (1)

Same Patch Batch · cakephp · 2026-08-24 · 3 CVEs total

CVE-2026-77635 9.2 CRITICAL CakePHP: FunctionsBuilder::jsonValue() vulerable to SQL injection with PostgresDriver
CVE-2026-77337 9.1 CRITICAL CakePHP: Potential Authentication bypass with CookieAuthenticator

IV. Related Vulnerabilities

Same product: cakephp
Same vendor: cakephp
Same weakness: CWE-93

V. Comments for CVE-2026-77634

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