External risk intelligence

Apache Allura REST API Mass Assignment Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-92119

Apache Allura is a web-based platform designed for project hosting, which typically involves exposing web APIs and interfaces to the internet or wide user networks to facilitate collaboration. As a web-based application, its REST API is commonly reachable as an internet-facing service in standard deployments.

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 critical vulnerability has been identified in Apache Allura, an open-source platform for project hosting and collaboration. This issue, related to how the system handles data assignments through its REST API, could potentially allow unauthorized access and modification of information. The main concern is to confirm if our deployed Allura instances are affected and to what extent.

The issue allows unauthorized data access and modification.
It impacts project hosting and collaboration platforms.
Confirm relevance and exposure for project hosting tools.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by interacting with the REST API of Apache Allura without needing any prior authentication. This is possible due to a mass assignment flaw that allows an attacker to modify sensitive data within the application. Successfully triggering this vulnerability could lead to significant compromise of the application's integrity and confidentiality.

Unauthenticated network access required.
Triggered via REST API mass assignment.
Risk of data compromise and modification.

Live Threat

Current exploitation, exposure, and threat context

A mass assignment vulnerability in Apache Allura's REST API could allow unauthenticated attackers to modify unintended attributes on server-side objects. This could lead to unauthorized changes to system configurations or user-related data when supported by the advisory.

Server-side object attributes at risk.
Unauthenticated API calls could alter attributes.
Unauthorized modification of system or user data.

Operational Fix

Recommended remediation, mitigation, and detection steps

Apache Allura's REST API Mass Assignment vulnerability likely impacts application owners and platform teams responsible for managing the Allura instances. The first practical step is to identify all deployed Apache Allura instances, determine their network reachability and business criticality, and confirm the accountable owner for each instance before planning remediation based on risk.

Application owners must address the issue.
Verify Allura instance reachability and criticality.
Plan remediation based on identified risks.

Supplementary metadata

CVSS vector

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.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Apache Allura?

Apache Allura is an open-source, web-based platform used by development teams to host projects and collaborate. It provides tools for issue tracking, source code management, and wikis. Because it serves as a central hub for project data, it relies heavily on REST APIs to manage information and enable seamless interaction between different parts of the platform and external services.

How does the CVE-2026-92119 mass assignment vulnerability work?

This flaw belongs to the CWE-915 weakness class. It happens when an application automatically binds user-supplied input to internal data structures without proper filtering. In this CVE, it allows an unauthenticated user to submit specially crafted API requests that change sensitive object attributes they should not have permission to modify, potentially altering system configurations or private project data.

What actions trigger this REST API flaw?

An attacker triggers this vulnerability by sending malicious network requests to the Apache Allura REST API endpoint. The bug does not require the attacker to have an existing account or credentials. Note that simply browsing the public-facing project pages of an Allura instance does not trigger this; the vulnerability specifically involves manipulating the backend object attributes through the API interface.

Is my Apache Allura instance at risk?

Halo Surface Signal notes that because Apache Allura is a collaboration platform, its REST API is frequently exposed to the internet or wide internal networks to support its core functions. If your instance is reachable over a network without strict access controls, it may be susceptible to these unauthorized API calls. You should treat instances with broader network reachability as having a higher priority for review.

Do I need to update my software to fix this?

Yes, upgrading is the recommended path to resolve this issue. First, create an inventory of all your Apache Allura instances to confirm which versions are running. Once you have identified all deployments, prioritize those that are network-accessible for an upgrade to version 1.22.0, which contains the necessary fix to prevent unauthorized data modification.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.