CVE-2026-27938Public exploitNetwork attack vector

Runner command execution via raw pull request body

Published Feb 26, 2026 · Updated Feb 26, 2026

OS command injection in WPGraphQL repository workflows before 2.9.1 allows remote authenticated users to execute runner commands. The Generate release notes step inserts the pull request body directly into a single-quoted shell command after GitHub expression substitution, so shell metacharacters alter the command stream. Execution requires a contributor-controlled pull request from develop to master to be merged by a maintainer; the flaw affects repository automation, not deployed plugins, and exposes workflow credentials to command access.

CVSS severity7.7
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in WPGraphQL repository workflows before 2.9.1 allows remote authenticated users to execute runner commands. The Generate release notes step inserts the pull request body directly into a single-quoted shell command after GitHub expression substitution, so shell metacharacters alter the command stream. Execution requires a contributor-controlled pull request from develop to master to be merged by a maintainer; the flaw affects repository automation, not deployed plugins, and exposes workflow credentials to command access.

The record

CVE
CVE-2026-27938
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
WPGraphQL
Product
WPGraphQL
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPGraphQL · WPGraphQLversion=< 2.9.1

Published CVSS scores

7.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo