WordPress MetForm plugin < 4.1.9 - Unauthenticated Email Header Injection vulnerability

Unauthenticated Email Header Injection vulnerability discovered by Artus KG in WordPress Plugin Metform versions 4.1.9...

CVE-2026-86813 MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To

The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted...

CVE-2026-86813

CVE-2026-86813 affects the MetForm WordPress plugin prior to version 4.1.9 . The vulnerability resides in how the plugin handles newline characters in user-submitted values that are placed into notification email headers, specifically the Reply-To field. An unauthenticated attacker can inject add...

EUVD-2026-76041

The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted...

CVE-2026-86813 MetForm < 4.1.9 - Unauthenticated Email Header Injection via Notification Reply-To

The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted...

PT-2026-89840

The MetForm WordPress plugin before 4.1.9 does not properly neutralize newline characters in user-submitted values that are placed into notification email headers, allowing unauthenticated attackers to inject additional email headers, such as Bcc, into the emails the site sends when a submitted...

form-data: form-data: Form field override via CRLF injection

A flaw was found in form-data, a library for creating readable multipart/form-data streams. A remote attacker can exploit this vulnerability by injecting carriage return CR, line feed LF, or double-quote " characters into the field argument of FormDataappend or the filename option. This allows th...

netty: io.netty/netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

A flaw was found in Netty. The HttpProxyHandler component, which handles HTTP CONNECT requests, does not properly validate user-provided outbound headers. This allows an attacker to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This could lead to unexpected...

Duplicate Advisory: Knowns Sandbox Escape: Unauthenticated Header Injection Grants AI Agent Unrestricted Access to Host Filesystem

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-9h2q-r9fh-f98w. This link is maintained to preserve external references. Original Description knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode...

netty: io.netty/netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

A flaw was found in Netty. The HttpProxyHandler component, which handles HTTP CONNECT requests, does not properly validate user-provided outbound headers. This allows an attacker to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This could lead to unexpected...

HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

SummaryHTTPX2 serializes the per-file Content-Type and custom headers supplied through the files= tuple API directly into the multipart/form-data body without validating custom header names or values. An attacker who can influence upload metadata passed to HTTPX2 can use CR or LF characters to...

PYSEC-2026-3848 HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

Summary HTTPX2 serializes the per-file Content-Type and custom headers supplied through the files= tuple API directly into the multipart/form-data body without validating custom header names or values. An attacker who can influence upload metadata passed to HTTPX2 can use CR or LF characters to...

Exploit for Improper Handling of Case Sensitivity in Apache Camel

CVE-2025-27636 – Apache Camel RCE Simple Python exploit for t...

GHSA-V25G-MVWR-F5FP webhookd: Unrestricted HTTP Header to Shell Variable Injection

Description Before 1.22, if the Basic Auth htpasswd middleware was not configured, all incoming HTTP headers were blindly forwarded to the webhook script execution environment as shell variables. While the Basic Auth middleware correctly strips the authentication header X-WebAuthn-User from the...

webhookd: Unrestricted HTTP Header to Shell Variable Injection

Description Before 1.22, if the Basic Auth htpasswd middleware was not configured, all incoming HTTP headers were blindly forwarded to the webhook script execution environment as shell variables. While the Basic Auth middleware correctly strips the authentication header X-WebAuthn-User from the...

PT-2026-89209

Name of the Vulnerable Software and Affected Versions webhookd versions prior to 1.22.0 Description Deployments without htpasswd authentication forward all incoming HTTP headers into the hook script environment via the HTTPParamsToShellVars function in pkg/api/index.go without using an allowlist...

CakePHP: SmtpTransport vulnerable to CRLF header injection

Impact Custom mail headers added with Message::setHeaders or addHeaders do not have CRLF replaced allowing header injection if user controlled data is added to message headers without stripping CRLF bytes. Patches 5.3.7, 5.2.14, 5.1.9, 4.6.5, 4.5.12 contain fixes for this issue. Workarounds You c...

EUVD-2026-65123

CakePHP: SmtpTransport vulnerable to CRLF header injection...

GHSA-2QH5-382H-3JPC CakePHP: SmtpTransport vulnerable to CRLF header injection

Impact Custom mail headers added with Message::setHeaders or addHeaders do not have CRLF replaced allowing header injection if user controlled data is added to message headers without stripping CRLF bytes. Patches 5.3.7, 5.2.14, 5.1.9, 4.6.5, 4.5.12 contain fixes for this issue. Workarounds You c...

GHSA-H4X7-GW46-3WM6 HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

Summary HTTPX2 serializes the per-file Content-Type and custom headers supplied through the files= tuple API directly into the multipart/form-data body without validating custom header names or values. An attacker who can influence upload metadata passed to HTTPX2 can use CR or LF characters to...