CVE-2026-78269: Shared Files Plugin SSRF Vulnerability

CVE-2026-78269 Overview

CVE-2026-78269 is a Server-Side Request Forgery (SSRF) vulnerability in the Shared Files WordPress plugin, affecting versions up to and including 1.7.69. The flaw allows authenticated users with Contributor-level privileges to coerce the WordPress server into issuing arbitrary outbound HTTP requests. Attackers can abuse this behavior to probe internal network resources, interact with cloud metadata endpoints, or reach services that trust the WordPress host. The vulnerability is classified under CWE-918: Server-Side Request Forgery.

Critical Impact
Contributor-level accounts can force the WordPress server to make attacker-controlled HTTP requests, exposing internal services and confidential data beyond the network perimeter.

Affected Products

WordPress shared-files plugin versions <= 1.7.69
WordPress sites permitting Contributor-level registration or role assignment
Hosting environments where the WordPress server has network reachability to internal services

Discovery Timeline

2026-08-24 - CVE-2026-78269 published to NVD
2026-08-24 - Last updated in NVD database

Technical Details for CVE-2026-78269

Vulnerability Analysis

The Shared Files plugin exposes functionality that accepts user-supplied URLs and processes them server-side without sufficient validation. A Contributor-authenticated attacker submits a crafted request pointing the plugin at an arbitrary destination. The plugin then issues an outbound HTTP call from the WordPress host to that destination.

Because the request originates from the WordPress server, it inherits the server's network position. Attackers can target internal-only services, private IP ranges, loopback interfaces, and cloud instance metadata services (IMDS). Response content, timing differences, or side-channel behavior can leak information back to the attacker.

The scope-changed impact reflected in the CVSS vector confirms that the vulnerability affects resources beyond the vulnerable plugin's own security boundary. Confidentiality and integrity impacts are both present but limited, and availability is not directly affected.

Root Cause

The root cause is missing or insufficient validation of a URL parameter processed by the plugin's server-side HTTP client. The plugin does not enforce an allow-list of hosts, does not restrict private and reserved IP ranges, and does not block redirects to sensitive destinations before issuing the outbound request.

Attack Vector

Exploitation requires network access to the WordPress site and a valid Contributor account. The attacker submits a plugin request containing a URL pointing to an internal target such as http://127.0.0.1:8080/, http://169.254.169.254/latest/meta-data/, or an internal application endpoint. The plugin issues the request server-side and may return response data or observable behavior to the authenticated attacker. See the Patchstack SSRF Vulnerability Advisory for further technical context.

Detection Methods for CVE-2026-78269

Indicators of Compromise

Outbound HTTP requests from the WordPress PHP worker to private IP ranges such as 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, or 127.0.0.0/8
Outbound requests to cloud metadata endpoints, including 169.254.169.254 on AWS, Azure, and GCP
Web server access logs showing Contributor-authenticated requests to shared-files plugin endpoints with URL parameters
Unusual DNS lookups originating from the WordPress host for attacker-controlled domains

Detection Strategies

Alert on any egress traffic from web application hosts destined for RFC1918 addresses or link-local metadata IPs
Correlate WordPress audit logs of Contributor accounts with outbound HTTP activity from the same host
Inspect web server request bodies for URL-shaped parameters submitted to shared-files plugin actions

Monitoring Recommendations

Enable WordPress activity logging for plugin actions and Contributor role usage
Forward web server, PHP-FPM, and host network telemetry to a centralized analytics platform for correlation
Baseline normal egress destinations for the WordPress tier and alert on deviations

How to Mitigate CVE-2026-78269

Immediate Actions Required

Update the Shared Files plugin to a version later than 1.7.69 as soon as the vendor publishes a fixed release
Audit existing Contributor accounts and remove or downgrade any that are not required
Restrict egress from WordPress hosts to only the destinations required for operation
Enforce IMDSv2 with hop-limit 1 on cloud instances to blunt metadata-service abuse

Patch Information

Refer to the Patchstack SSRF Vulnerability Advisory for the current patched version and vendor guidance. Apply the update through the WordPress plugin manager or WP-CLI once available.

Workarounds

Temporarily deactivate the Shared Files plugin until a patched version is installed
Disable Contributor registrations and require administrator approval for role elevation
Deploy a web application firewall rule blocking plugin requests whose URL parameters resolve to private or link-local addresses
Route WordPress outbound traffic through an egress proxy that enforces a destination allow-list

bash

# Configuration example
wp plugin deactivate shared-files
wp plugin update shared-files
wp user list --role=contributor --format=table