CVE-2026-11624

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced...

EUVD-2026-36650

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced...

CVE-2026-11624

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced...

CVE-2026-11624

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced...

CVE-2026-11624

The CVE-2026-11624 entry concerns the Model Context Protocol server where origin validation of the Origin header affects DNS rebinding risk. Before v0.25.0 there was no host validation; v0.25.0 introduces --allowed-hosts and --allowed-origins flags to specify permitted hosts at startup. Both flag...

PT-2026-49089

Name of the Vulnerable Software and Affected Versions Model Context Protocol versions prior to 0.25.0 Description Servers fail to validate the "Origin" header on incoming connections, which may allow DNS rebinding attacks. DNS rebinding is a method of bypassing the Same-Origin Policy to interact...

CVE-2026-50635

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default and documented configuration, so LSHttpRequest::checkIsAllowedHost results in no operation....

Reliance on Untrusted Inputs in a Security Decision

Overview litestar is a Litestar - A production-ready, highly performant, extensible ASGI API Framework Affected versions of this package are vulnerable to Reliance on Untrusted Inputs in a Security Decision through the AllowedHostsMiddleware in the host validation middleware. An attacker can bypa...

GHSA-3QMC-CJ7Q-62HV Litestar: AllowedHostsMiddleware bypasses host validation via client-controlled X-Forwarded-Host header

Summary AllowedHostsMiddleware trusts the X-Forwarded-Host header as a fallback when the Host header is absent. Since X-Forwarded-Host is a client-controllable header, an attacker can bypass the allowed hosts validation by omitting the Host header and supplying an X-Forwarded-Host header set to a...

Litestar: AllowedHostsMiddleware bypasses host validation via client-controlled X-Forwarded-Host header

Summary AllowedHostsMiddleware trusts the X-Forwarded-Host header as a fallback when the Host header is absent. Since X-Forwarded-Host is a client-controllable header, an attacker can bypass the allowed hosts validation by omitting the Host header and supplying an X-Forwarded-Host header set to a...

PT-2026-48543

Summary AllowedHostsMiddleware trusts the X-Forwarded-Host header as a fallback when the Host header is absent. Since X-Forwarded-Host is a client-controllable header, an attacker can bypass the allowed hosts validation by omitting the Host header and supplying an X-Forwarded-Host header set to a...

CVE-2026-9739

Vulnerable to DNS rebinding attacks when using SSE http://b/499408790. During the beta phase, we implemented allowed-origins and allowed-hosts flags to align with MCP security guidelines. However, the hardcoded Access-Control-Allow-Origin: header in the SSE initialization handler was inadvertentl...

Kibana 9.3.3 Security Update (ESA-2026-40)

Server-Side Request Forgery SSRF in Kibana Leading to Unauthorized Network Access Server-Side Request Forgery CWE-918 in Kibana can allow an authenticated user with connector management privileges to bypass the operator-configured connector allowlist, causing the Kibana server to issue outbound...

Kibana 9.2.8, and 9.3.2 Security Update (ESA-2026-37)

Server-Side Request Forgery SSRF in Kibana Leading to Unauthorized Network Access Server-Side Request Forgery CWE-918 in Kibana allows authenticated users with connector management privileges to bypass the operator-configured connection allowlist. By configuring a Webhook connector with a crafted...

CVE-2026-9739

Vulnerable to DNS rebinding attacks when using SSE http://b/499408790. During the beta phase, we implemented allowed-origins and allowed-hosts flags to align with MCP security guidelines. However, the hardcoded Access-Control-Allow-Origin: header in the SSE initialization handler was inadvertentl...

Symfony has an HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Description symfony/html-sanitizer lets applications sanitise untrusted HTML. The configuration methods allowLinkHosts... and allowLinkSchemes... are intended to restrict targets to an allowlist of hosts/schemes; allowMediaHosts / allowMediaSchemes do the same for etc. Three distinct bypasses all...

PT-2026-44123

Name of the Vulnerable Software and Affected Versions Toolbox affected versions not specified Description The software is susceptible to DNS rebinding attacks when using Server-Sent Events SSE under specification v2024-11-05. This occurs because the SSE initialization handler retains a hardcoded...

Nautobot: Webhook definitions could be used for server-side request forgery (SSRF)

Impact Nautobot's Webhook data model and associated feature set could be configured by users with sufficient access to perform requests to various hosts and IP addresses that should not be permitted, allowing for various behaviors similar to server-side request forgery SSRF. Patches Fixes are...

PT-2026-40719

Name of the Vulnerable Software and Affected Versions Nautobot versions prior to 2.4.33 Nautobot versions prior to 3.1.2 Description The Webhook data model and associated feature set can be configured by users with sufficient access to perform requests to unauthorized hosts and IP addresses. This...

RUSTSEC-2026-0140 DNS rebinding and cross-origin CSRF in dynoxide's MCP HTTP transport

dynoxide's MCP HTTP transport was vulnerable to DNS rebinding via its transitive rmcp dependency, plus a related cross-origin CSRF gap. A malicious web page could make the user's browser send requests to a local dynoxide mcp --http or dynoxide serve --mcp server with a non-loopback Host header,...