CVE-2026-118665

HighCVSS 8.2

Published: 28/10/2026(UTC)Updated: 29/10/2026(UTC)Translated: 28/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.39%

33th percentile - higher than 33% of all known CVEs

Summary

Prior to version 1.1.36 of the GraphQL Tools legacy WebSocket executor package, buildWSLegacyExecutor retains request.extensions.connectionParams in the closure-scoped executorConnectionParams object after cleanupWebsocket closes a connection. When one executor is reused across different authorization contexts, a later request can send an earlier caller's Authorization or tenant value in its connection_init payload.

Risk Assessment

The downstream server may authenticate a later caller as an earlier user, leading to impersonation and unauthorized data access.

Recommendation

Update the GraphQL Tools legacy WebSocket executor package to version 1.1.36 or later. Avoid reusing a single executor across different authorization contexts.

Other vulnerabilities in GraphQL Tools legacy WebSocket executor

CVE-2026-118666Medium
Prior to version 1.1.36 of the GraphQL Tools legacy WebSocket executor package, buildWSLegacyExecutor reuses one WebSocket and replaces its single websocket.onmessage handler whenever a new overlapping subscription starts. The handler delivers LEGACY_WS.DATA frames to the newest observer without comparing data.id with the subscription operation id, so a caller can receive another user's authorized subscription payload.

Original NVD description (English source)

GraphQL Tools provides utilities for building, stitching, and mocking GraphQL schemas. Prior to version 1.1.36 of the GraphQL Tools legacy WebSocket executor package, buildWSLegacyExecutor in packages/executors/legacy-ws/src/index.ts retains request.extensions.connectionParams in the closure-scoped executorConnectionParams object after cleanupWebsocket closes a connection. When one executor is reused across different authorization contexts, a later request that omits a sensitive key can send an earlier caller's Authorization or tenant value in its connection_init payload, causing the downstream server to authenticate the later caller as the earlier user. Applications that create a new executor for every request are not affected. This issue is fixed in version 1.1.36 of the GraphQL Tools legacy WebSocket executor package.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS