ardatan graphql-tools up to 1.1.35 legacy WebSocket executor index.ts buildWSLegacyExecutor improper authorization

Summaryinfo

A vulnerability was found in ardatan graphql-tools up to 1.1.35 and classified as critical. This vulnerability affects the function buildWSLegacyExecutor of the file packages/executors/legacy-ws/src/index.ts of the component legacy WebSocket executor. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-118666. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ardatan graphql-tools up to 1.1.35. Affected by this issue is the function buildWSLegacyExecutor of the file packages/executors/legacy-ws/src/index.ts of the component legacy WebSocket executor. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 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 using the same executor can receive another user's authorized subscription payload while the earlier caller's stream is starved. This issue is fixed in version 1.1.36 of the GraphQL Tools legacy WebSocket executor package.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-118666 since 10/28/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 1.1.36 eliminates this vulnerability.

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Productinfo

Vendor

• ardatan

Name

• graphql-tools

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8
• 1.1.9
• 1.1.10
• 1.1.11
• 1.1.12
• 1.1.13
• 1.1.14
• 1.1.15
• 1.1.16
• 1.1.17
• 1.1.18
• 1.1.19
• 1.1.20
• 1.1.21
• 1.1.22
• 1.1.23
• 1.1.24
• 1.1.25
• 1.1.26
• 1.1.27
• 1.1.28
• 1.1.29
• 1.1.30
• 1.1.31
• 1.1.32
• 1.1.33
• 1.1.34
• 1.1.35

Website

• Product: https://github.com/ardatan/graphql-tools/

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