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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 是一个用于 PHP 的快速开发框架。在 4.5.12、4.6.5、5.1.8、5.2.14 和 5.3.7 版本之前（分别对应各自的发布分支），通过 或 方法添加的自定义邮件头中，未对 CRLF（回车换行）字符进行过滤移除，导致当邮件头中包含用户可控的数据时，可能发生头部注入漏洞。该问题已在上述指定版本中得到修复。

CVSS 8.2 · High EPSS 0.31% · P23

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

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 Premium
Qwen3.6-35B-A3B · 6962 chars
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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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