CVE-2025-9552: Drupal Synchronize Composer Vulnerability

CVE-2025-9552 Overview

CVE-2025-9552 affects the Drupal contributed module Synchronize composer.Json With Contrib Modules. The vulnerability allows a network-based attacker to obtain limited confidential information without authentication or user interaction. The module synchronizes a Drupal site's composer.json file with installed contributed modules, and the flaw exposes information that should remain restricted. The Drupal security team published advisory SA-CONTRIB-2025-102 describing the issue.

Critical Impact
An unauthenticated remote attacker can access limited confidential data exposed by the module, with no impact on integrity or availability.

Affected Products

Drupal contributed module: Synchronize composer.Json With Contrib Modules (all versions covered by advisory SA-CONTRIB-2025-102)
Drupal sites that install and enable this contributed module
Deployments exposing the module's endpoints to untrusted networks

Discovery Timeline

2025-10-10 - CVE-2025-9552 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9552

Vulnerability Analysis

The vulnerability is an information disclosure issue in the Synchronize composer.Json With Contrib Modules Drupal module. The CWE assignment is NVD-CWE-noinfo, meaning the NVD has not classified the specific weakness. The advisory indicates that a remote attacker can trigger the flaw over the network without prior authentication and without user interaction. The impact is limited to confidentiality: integrity and availability are not affected. The EPSS estimate places the likelihood of exploitation observed in the wild at a low level, and no public proof-of-concept has been catalogued at the time of writing.

Root Cause

The root cause is not enumerated in the public advisory beyond an information exposure category. The module handles synchronization between Drupal's contributed module set and the site's composer.json file, which typically requires elevated permissions. When access controls or output filtering on the synchronization workflow are insufficient, unprivileged network callers can retrieve data from that workflow. Site administrators should consult the Drupal Security Advisory SA-CONTRIB-2025-102 for the maintainer's technical description.

Attack Vector

An attacker sends crafted HTTP requests to the affected Drupal site over the network. No authentication and no user interaction are required. The attacker receives content that would normally require privileged access, disclosing limited data related to composer or contributed module state. Because integrity and availability remain intact, the vulnerability is used for reconnaissance or as a preparatory step in a broader intrusion chain rather than for direct compromise.

No verified proof-of-concept code is available. Refer to the Drupal Security Advisory for the maintainer's remediation guidance.

Detection Methods for CVE-2025-9552

Indicators of Compromise

Unauthenticated HTTP requests targeting paths installed by the Synchronize composer.Json With Contrib Modules module
Anomalous outbound responses containing fragments of composer.json content or contributed module metadata
Access log entries from unfamiliar IP addresses enumerating Drupal module endpoints

Detection Strategies

Review Drupal watchdog and web server access logs for repeated requests to routes exposed by the module
Correlate high-volume, low-privilege GET requests with User-Agent values typical of scanners
Compare current module version against the fixed version noted in SA-CONTRIB-2025-102

Monitoring Recommendations

Forward Drupal and reverse-proxy logs to a centralized SIEM for cross-site correlation
Alert on unauthenticated access to administrative or module-management URIs
Track exposure of dependency metadata that could aid follow-on supply-chain reconnaissance

How to Mitigate CVE-2025-9552

Immediate Actions Required

Identify Drupal sites running the Synchronize composer.Json With Contrib Modules contributed module using drush pm:list or the module administration UI
Apply the fixed release referenced in SA-CONTRIB-2025-102 or disable the module until patched
Restrict access to module-provided routes via web server or firewall rules while remediation is planned

Patch Information

The Drupal Security Team published advisory SA-CONTRIB-2025-102 with remediation instructions. Administrators must update the Synchronize composer.Json With Contrib Modules module to the fixed version identified in the advisory. Refer to the Drupal Security Advisory for exact version numbers, patch download links, and any post-upgrade steps required to restore module functionality.

Workarounds

Uninstall the module until a patched release is deployed, if the synchronization feature is not business-critical
Block external access to Drupal administrative and module-specific paths with a web application firewall
Enforce authentication for all non-public routes through Drupal's access control settings

bash

# Update the affected contributed module using Composer and Drush
composer update drupal/synchronize_composerjson_with_contrib_modules --with-dependencies
drush updatedb -y
drush cache:rebuild