Description

Unauthenticated REST disclosure of certain content items in Apache Allura. This issue affects Apache Allura: through 1.19.1. Users are recommended to upgrade to version 1.20.0, which fixes the issue.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.3",
  "pubDate": "2026-08-24T17:18:17.340Z",
  "pubdate": "2026-08-24T17:18:17.340Z",
  "executiveSummary": "An unauthenticated information disclosure vulnerability has been identified in Apache Allura, specifically affecting versions through 1.19.1. The flaw resides within the REST API endpoint handling mechanism, allowing remote, unauthenticated adversaries to improperly access and retrieve sensitive content items that should otherwise be restricted.\nThe primary impact of this vulnerability is the unauthorized exposure of confidential data stored within the affected systems, potentially compromising sensitive project assets, user metadata, or internal communications managed by the platform. The risk implications are severe for deployments housing proprietary or sensitive development data, as unauthorized third parties can harvest protected information without requiring valid credentials or prior system interaction.\nExploitation requirements are minimal, as the attack vector requires no authentication, privilege level, or user interaction, enabling automated exploitation over the network. Remediation requires upgrading the affected Apache Allura installation to version 1.20.0, which resolves the flaw by properly enforcing access control checks on the vulnerable REST endpoints.",
  "technicalDetails": "The vulnerability is classified as an unauthenticated REST disclosure flaw affecting Apache Allura through version 1.19.1. The root cause stems from insufficient access control validation and authorization enforcement within the RESTful API routing and controller logic responsible for serving specific content items. Specifically, the application fails to adequately verify whether an incoming API request originates from an authenticated and authorized session prior to querying and returning the requested data structures.\nThe vulnerable component involves the REST interface handlers of Apache Allura, which expose application resources over HTTP/HTTPS protocols. Network exposure is broad, as these endpoints are typically accessible to any entity capable of reaching the web server hosting the Apache Allura instance. Because the application lacks proper session validation and permission checks at the API boundary, malicious actors can directly query targeted REST endpoints without supplying authentication tokens, API keys, or session cookies.\nThe attack flow proceeds as follows: an unauthenticated adversary crafts an HTTP GET or similar REST request targeting specific content item endpoints exposed by the Apache Allura API. Upon receipt of the request, the vulnerable component processes the query without verifying the caller's identity or authorization status. The backend retrieves the requested content items from the underlying data store and serializes the response, returning the sensitive data directly to the client in the HTTP response body.\nPost-exploitation impact is characterized by the unauthorized retrieval of protected intellectual property, source code references, issue trackers, and internal documentation accessible via the platform. Attackers can script automated harvesting tools to traverse accessible API routes, maximizing data exfiltration efficiency. Privilege requirements are entirely absent, and no special capabilities are needed beyond network connectivity to the target instance. Mitigation of this technical defect is achieved by updating the software to version 1.20.0, where rigorous authorization checks are enforced across all sensitive REST endpoints."
}