Starlette - Improper Validation of Unsafe Equivalence in Input

A flaw was found in Starlette, a lightweight ASGI Asynchronous Server Gateway Interface framework. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP Host request header. This malformed header could cause the request.url to be incorrectly reconstructed, leading...

ExponentCMS <= 2.6 - Host Header Injection

An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponentconstants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM. id: CVE-2021-38751 info: name: ExponentCMS = 2.6 - Host Header Injection author:...

Plone Docker - Host Header Injection

Plone Docker Official Image 5.2.13 5221 is vulnerable to Host Header Injection due to improper validation of input by the HOST headers. This can lead to Cross-Site Scripting XSS attacks when the malicious Host header value is reflected in the response. id: CVE-2024-23055 info: name: Plone Docker ...

Astro SSR - Server-Side Request Forgery

Astro before 5.17.3 and @astrojs/node before 9.5.4 are vulnerable to full-read SSRF due to improper Host header validation in error page rendering, allowing attackers to redirect requests and access internal resources. id: CVE-2026-25545 info: name: Astro SSR - Server-Side Request Forgery author:...

EUVD-2026-48436

9router 0.4.59 fixed in 0.4.60 contains a chain of vulnerabilities: a hardcoded default password 123456 that authenticates any fresh installation, a bypass of the LOCALONLY network gate via a spoofed Host header, and unvalidated arguments passed to childprocess.spawn when registering MCP plugins....

CVE-2026-63732

9router 0.4.59 (fixed in 0.4.60) contains a chain of vulnerabilities: a hardcoded default password (123456) that authenticates fresh installs; a bypass of the LOCAL_ONLY network gate via a spoofed Host header; and unvalidated arguments passed to child_process.spawn() when registering MCP plugins....

PT-2026-64186

9router 0.4.59 fixed in 0.4.60 contains a chain of vulnerabilities: a hardcoded default password 123456 that authenticates any fresh installation, a bypass of the LOCAL ONLY network gate via a spoofed Host header, and unvalidated arguments passed to child process.spawn when registering MCP plugin...

GHSA-89XV-2M56-2M9X Next.js: Server-Side Request Forgery in Server Actions on custom servers

Impact When a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host Server-Side Request Forgery. This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtai...

Next.js: Server-Side Request Forgery in Server Actions on custom servers

Impact When a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host Server-Side Request Forgery. This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtai...

EUVD-2026-43646

Eclipse Jetty: HTTP Authority/Host mismatch...

PT-2026-63548

Netty's HTTP/2-to-HTTP/1.x translation layer Http2StreamFrameToHttpObjectCodec and InboundHttp2ToHttpAdapter fails to deduplicate or validate Host headers when an HTTP/2 client supplies both the :authority pseudo-header and a literal host header in a single HEADERS frame. The translator maps...

PT-2026-63564

Impact When a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host Server-Side Request Forgery. This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtai...

GHSA-2X63-GW47-W4MM websocket-driver-ruby: Denial of service via malformed Host header

Impact If this library is used to implement a WebSocket server on top of a TCP server, by using the WebSocket::Driver.server method, then a client can cause the server to crash by sending a Host header that is not a valid host:port string. When this happens, a URI::InvalidURIError exception is...

EUVD-2025-210492

In Microsoft Azure API Management through 2025-10-17, when self-service signup username/password Basic Authentication is enabled in Tenant A, an attacker can reuse the registration flow by changing the hostname or tenant identifier to Tenant B, even when Tenant B has signup disabled at the UI...

CVE-2025-66390

In Microsoft Azure API Management through 2025-10-17, when self-service signup username/password Basic Authentication is enabled in Tenant A, an attacker can reuse the registration flow by changing the hostname or tenant identifier to Tenant B, even when Tenant B has signup disabled at the UI...

Ruby on Rails - Open Redirect via Host Header Injection

Ruby on Rails action pack before 6.1.2.1, 6.0.3.5 contains an open redirect caused by special crafted Host headers in combination with allowed host formats, letting attackers redirect users to malicious websites, exploit requires attacker to control Host headers. id: CVE-2021-22881 info: name: Ru...

CVE-2025-66390

In Microsoft Azure API Management through 2025-10-17, when self-service signup username/password Basic Authentication is enabled in Tenant A, an attacker can reuse the registration flow by changing the hostname or tenant identifier to Tenant B, even when Tenant B has signup disabled at the UI...

CVE-2025-66390

In Microsoft Azure API Management through 2025-10-17, when self-service signup username/password Basic Authentication is enabled in Tenant A, an attacker can reuse the registration flow by changing the hostname or tenant identifier to Tenant B, even when Tenant B has signup disabled at the UI...

CVE-2025-66390

In Microsoft Azure API Management through 2025-10-17, when self-service signup username/password Basic Authentication is enabled in Tenant A, an attacker can reuse the registration flow by changing the hostname or tenant identifier to Tenant B, even when Tenant B has signup disabled at the UI...

CVE-2025-66390

CVE-2025-66390 affects Microsoft Azure API Management Developer Portal: when Basic Authentication signup is enabled in Tenant A, an attacker can register on Tenant B by altering the Host header, bypassing a UI-level signup disable because the underlying /signup API remains accessible and validate...