wp-graphql up to 2.9.0 release.yml os command injection

Summaryinfo

A vulnerability described as critical has been identified in wp-graphql up to 2.9.0. The impacted element is an unknown function of the file release.yml. Executing a manipulation can lead to os command injection. This vulnerability is handled as CVE-2026-27938. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in wp-graphql up to 2.9.0 and classified as critical. This vulnerability affects an unknown code block of the file release.yml. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

WPGraphQL provides a GraphQL API for WordPress sites. Prior to version 2.9.1, the `wp-graphql/wp-graphql` repository contains a GitHub Actions workflow (`release.yml`) vulnerable to OS command injection through direct use of `${{ github.event.pull_request.body }}` inside a `run:` shell block. When a pull request from `develop` to `master` is merged, the PR body is injected verbatim into a shell command, allowing arbitrary command execution on the Actions runner. Version 2.9.1 contains a fix for the vulnerability.

The advisory is available at github.com. This vulnerability was named CVE-2026-27938 since 02/25/2026. The exploitation appears to be difficult. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 2.9.1 eliminates this vulnerability. Applying the patch de0c2d590593f1099546ad517106e454a498bc58 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• WordPress Plugin

Name

• wp-graphql

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

License

• open-source

Website

• Product: https://github.com/wp-graphql/wp-graphql/

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