GO-2026-5300 Algernon: Auto-refresh SSE event server binds to all interfaces with Access-Control-Allow-Origin: * and no authentication in github.com/xyproto/algernon

Algernon: Auto-refresh SSE event server binds to all interfaces with Access-Control-Allow-Origin: and no authentication in github.com/xyproto/algernon...

CVE-2026-56280 Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect

Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect using the privileged...

CVE-2026-56280

Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect using the privileged...

CVE-2026-56280 Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect

Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect using the privileged...

CVE-2026-56280 Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect

Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect using the privileged...

GHSA-X227-PF99-VFFG PraisonAI: MCP SSE transport binds 0.0.0.0 with no authentication and no Origin validation; bundled SecurityConfig is never wired in

The MCP SSE server started via ToolsMCPServer.runsse / launchtoolsmcpservertransport="sse" binds to 0.0.0.0 by default and builds its Starlette application with no authentication middleware and no Origin-header validation. The module mcp/mcpsecurity.py provides exactly the needed controls origin...

PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools

PraisonAI ToolsMCPServer legacy SSE transport accepts attacker Host/Origin and exposes registered tools Summary praisonaiagents.mcp.ToolsMCPServer.runsse builds a Starlette MCP HTTP+SSE server around mcp.server.sse.SseServerTransport. The server exposes /sse and /messages/, but it does not valida...

PT-2026-61777

Name of the Vulnerable Software and Affected Versions praisonai-agents affected versions not specified Description The MCP SSE server, when started via ToolsMCPServer.run sse or launch tools mcp servertransport="sse", binds to 0.0.0.0 by default and lacks authentication middleware and Origin-head...

CVE-2026-48814

Network-AI is a TypeScript/Node.js multi-agent orchestrator. In versions 5.7.1 and earlier, the MCP SSE server allows unauthenticated cross-origin MCP tool invocation due to an empty default secret. This issue was partially addressed by CVE-2026-46701 in version 5.4.5 by closing the CORS flaw wit...

CVE-2026-48814 Network-AI: Empty default secret still authorizes all requests (Incomplete fix for CVE-2026-46701)

Network-AI is a TypeScript/Node.js multi-agent orchestrator. In versions 5.7.1 and earlier, the MCP SSE server allows unauthenticated cross-origin MCP tool invocation due to an empty default secret. This issue was partially addressed by CVE-2026-46701 in version 5.4.5 by closing the CORS flaw wit...

CVE-2026-48814: Missing Authentication for Critical Function

Network-AI is a TypeScript/Node.js multi-agent orchestrator. In versions 5.7.1 and earlier, the MCP SSE server allows unauthenticated cross-origin MCP tool invocation due to an empty default secret. This issue was partially addressed by CVE-2026-46701 in version 5.4.5 by closing the CORS flaw wit...

PT-2026-50183

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=520318421 Crash type: Use-of-uninitialized-value Crash state: vp8 regular quantize b sse4 1 macro block yrd vp8 rd pick intra mode...

Permissive Cross-domain Policy with Untrusted Domains

Overview Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains in the SSE initialization handler due to the use of a hardcoded Access-Control-Allow-Origin: header. An attacker can gain unauthorized access to sensitive resources by exploiting DNS...

CVE-2026-9739

CVE-2026-9739 describes a DNS rebinding vulnerability due to a hardcoded Access-Control-Allow-Origin: * in the SSE initialization handler, despite earlier attempts to align with MCP security guidelines using allowed-origins and allowed-hosts. The issue specifically affects users connecting via To...

CVE-2026-44830 Empty API_TOKEN disables authentication on network-reachable HTTP/SSE transport

Nocturne Memory is a lightweight, rollbackable, and visual Long-Term Memory Server for MCP Agents. Prior to 2.4.1, when APITOKEN is unset or empty, the BearerTokenAuthMiddleware bypasses authentication for all HTTP requests. Combined with the default 0.0.0.0 host binding and CORS alloworigins="",...

CVE-2026-9739: Permissive Cross-domain Policy with Untrusted Domains

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...

CVE-2026-44895 GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

CVE-2026-44895 GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

EUVD-2026-32003

GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: on every response. The structural defect is that the SSE server stands up a stateful,...

CVE-2026-44895

CVE-2026-44895 (GitLab MCP Server SSE transport) has concrete technical details in the connected documents. The MCP server’s SSE HTTP transport (USE_SSE=true) ships with no authentication and sets Access-Control-Allow-Origin: * on all responses, exposing a stateful RPC endpoint backed by the oper...