CVE-2026-53965

CVE-2026-53965 affects the MCP PHP SDK (Composer package mcp/sdk), versions 0.5.0 through 0.7.0 . The HttpTransport class's processSSEStream() method appends each 4 KiB read chunk to an in-memory buffer ($this->sseBuffer) with no upper bound ; the buffer is only flushed upon encountering the S...

CVE-2026-73405

An authorization bypass vulnerability in Vulnerability-Lookup allowed inactive or unconfirmed accounts to subscribe to Server-Sent Events SSE streams through the /pubsub/subscribe/ endpoint. The tokenrequired decorator used by the Pub/Sub interface authenticated requests solely by matching the...

EUVD-2026-57223

An authorization bypass vulnerability in Vulnerability-Lookup allowed inactive or unconfirmed accounts to subscribe to Server-Sent Events SSE streams through the /pubsub/subscribe/ endpoint. The tokenrequired decorator used by the Pub/Sub interface authenticated requests solely by matching the...

CVE-2026-31950: Improper Access Control

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint /api/agents/chat/stream/:streamId does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and...