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CVE-2026-27938

HighPublished

WPGraphQL Repo Vulnerable to Command Injection via Unsanitized GitHub Actions Expression in Release Workflow

Published: Feb 26, 2026
Updated: Feb 26, 2026
Assigning CNA: GitHub_M
Evidence observed: Sep 4, 2026

Primary CVSS

7.7/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 54.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

gha-lab-a7f6217d26Research
Security-research reproduction of CVE-2026-27938 / GHSA-4q9f-mjxf-rx7x (GitHub Actions expression injection in release workflows) — snapshot of wp-graphql/wp-graphql at b216fe22f3a119f256511ec7353f536fee6886ac

Responsible use

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