External risk intelligence

Apache Allura Argument Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-73240

Apache Allura is a web-based forge platform used for hosting software projects. As a project management and code hosting application, it is commonly deployed as a public-facing web service to facilitate external collaboration, bug tracking, and repository access.

Apache Allura

before 1.19.1

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security vulnerability has been identified in Apache Allura, a web-based platform used for managing software projects. This issue involves the potential for attackers to inject commands through specially crafted inputs, which could lead to unauthorized access and manipulation of the system. The main concern is to confirm whether your organization uses this technology and assess any potential exposure.

  • Input flaws allow command injection.
  • Affects project management and code hosting.
  • Confirm Allura usage and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could send specially crafted input to a web-facing Apache Allura instance to inject arguments into the Git command. This could allow them to execute arbitrary commands on the server.

  • Exposed to the internet.
  • Malicious input to Git command.
  • Server-side command execution.

Live Threat

Current exploitation, exposure, and threat context

When specially crafted inputs are provided, Apache Allura may be vulnerable to an argument injection flaw. This could potentially impact the integrity and confidentiality of data, and affect the availability of the service.

  • System data and service behavior may be affected.
  • Injection could occur via specially crafted inputs.
  • Potential for data compromise or denial of service.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for application platforms and web services are likely to manage Apache Allura deployments. The first practical step is to locate all instances of this technology within your environment, confirm its reachability and business criticality, and then identify the accountable owner to initiate remediation planning.

  • Identify Allura instances and owners.
  • Verify external reachability and criticality.
  • Plan risk-based remediation.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Apache Allura?

Apache Allura is an open-source, web-based platform designed to host software projects. It provides tools for teams to manage code repositories, track bugs, and coordinate development tasks, often serving as a central hub for collaborative software engineering workflows.

What does CVE-2026-73240 mean for Apache Allura?

This vulnerability is classified as CWE-88, which involves improper neutralization of arguments used in a command. In this case, the flaw allows an attacker to inject malicious parameters into Git commands processed by the platform, potentially leading to unauthorized command execution on the host server.

How do attackers trigger this argument injection?

An attacker triggers this by submitting specially crafted inputs to the application that are improperly processed by the system's underlying Git commands. Simply viewing pages or interacting with standard, non-malicious repository features does not trigger the flaw; it requires the submission of specifically designed input patterns.

Is my Apache Allura instance at risk?

According to Halo Surface Signal, this software is typically deployed as a public-facing web service to support external collaboration. Any instance reachable via the internet is considered to have a higher potential for access, though internal-only instances should also be reviewed for their reachability and overall security posture.

How do I fix this security issue?

The primary response is to upgrade your Apache Allura deployment to version 1.19.1. You should start by auditing your environment to locate all instances, determine who owns them, and coordinate an update to the patched version as soon as possible to mitigate the risk of command injection.

References