External risk intelligence

WebdriverIO could allow external attacker to steal credentials and compromise build systems

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-25244

An external attacker could exploit WebdriverIO by using a malicious repository to run unauthorized code on CI/CD servers or developer machines. This could lead to the theft of sensitive credentials, source code, and secrets, potentially resulting in a compromise of your build systems.

1Halo Surface Signal

OS Command Injection

Openjsf Webdriverio

before 9.24.0

External exposure likelihood

Halo Surface Signal score for CVE-2026-25244

This vulnerability affects a test automation framework used during build-time on developer machines or internal CI/CD pipelines. These environments are typically not exposed to the public internet, as they are used for internal development and build orchestration tasks rather than serving external network traffic.

Horizon Alert

Summary of the vulnerability and why it matters

This critical vulnerability allows for arbitrary code execution when processing Git branches in the WebdriverIO test automation framework. If malicious Git repositories are used in test orchestration, this can lead to serious security breaches.

Affects test automation systems.
Can compromise sensitive data.
Enables supply chain attacks.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by tricking a developer or CI/CD system into running a test from a malicious Git repository. The malicious repository would contain a specially crafted branch name that includes shell commands. When the WebdriverIO framework processes this branch name, it executes the commands, leading to arbitrary code execution on the compromised system.

Malicious Git repository source.
Unsanitized branch name interpolation.
Code execution on CI/CD or dev machines.

Live Threat

Current exploitation, exposure, and threat context

Attackers may find this command injection vulnerability in WebdriverIO less appealing for widespread exploitation due to its context within a testing framework. While it allows for RCE on CI/CD servers or developer machines, these environments are generally not directly accessible from the public internet, limiting the attack surface. The primary targets would likely be organizations using this specific framework for their development and build processes, suggesting more targeted attacks rather than broad campaigns.

Exploitation requires control over repository or local directory.
No public exploit code observed.
Focus on CI/CD and developer environments.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize immediately updating WebdriverIO to version 9.24.0 or later to address the critical command injection vulnerability. This vulnerability allows for remote code execution through specially crafted Git branch names, posing a severe risk to CI/CD servers and developer machines, potentially leading to credential disclosure, code exfiltration, and supply chain attacks.

Update WebdriverIO to 9.24.0 or higher.
Block or isolate repositories with malicious branch names.
Monitor build systems for anomalous activity.

Frequently asked questions

What is WebdriverIO and what is its primary function in software development?

WebdriverIO is a versatile test automation framework designed for unit, end-to-end, and component testing. It empowers developers and testers by automating the validation of web and application software functionality, ensuring it behaves as intended.

How does the CVE-2026-25244 vulnerability exploit WebdriverIO's command injection weakness?

CVE-2026-25244 is a command injection vulnerability. It arises when WebdriverIO processes Git branch names containing special characters, enabling an attacker to execute arbitrary commands on the system running the tests. This occurs because Git permits branch names with shell metacharacters, which are then interpolated directly into `execSync()` calls without proper sanitization.

What specific conditions must be met for an attacker to trigger the WebdriverIO vulnerability?

An attacker can exploit this by providing a malicious Git repository, either through `testOrchestrationOptions.runSmartSelection.source` or by controlling the current directory if unset. The malicious repository must have a branch name containing an embedded payload, which then causes the system's shell to execute arbitrary code.

What is the relevance of CVE-2026-25244 to system security and supply chains?

This vulnerability can lead to remote code execution on CI/CD servers and developer machines, potentially resulting in credential and secret disclosure, exfiltration of source code and SSH keys, system compromise, and supply chain attacks through tampered build artifacts. Halo Surface Signal assesses this vulnerability as very unlikely to be exploited broadly due to its context within a test automation framework, typically housed in internally facing environments.

What is the recommended action to mitigate the WebdriverIO command injection vulnerability?

The critical command injection vulnerability can be mitigated by updating WebdriverIO to version 9.24.0 or later. This update addresses the issue of remote code execution via specially crafted Git branch names, which poses a significant risk to CI/CD servers and developer machines.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.