CVE-2025-46503: Simple Google Photos Grid SSRF Vulnerability

CVE-2025-46503 is a Server-Side Request Forgery flaw in Simple Google Photos Grid plugin versions up to 1.5 that enables attackers to force the server to make unauthorized requests. This article covers technical analysis, affected versions, security implications, and recommended mitigation strategies.

CVE-2025-46503 Overview

CVE-2025-46503 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] affecting the Simple Google Photos Grid WordPress plugin developed by josheli. The flaw impacts all plugin versions up to and including 1.5. An authenticated attacker with low privileges can coerce the WordPress server into issuing arbitrary outbound HTTP requests. This can be used to probe internal network resources, interact with cloud metadata endpoints, or reach services otherwise inaccessible from the public internet.

Critical Impact
Attackers with low-privilege authenticated access can force the vulnerable WordPress instance to make server-side HTTP requests to attacker-chosen destinations, enabling internal network reconnaissance and limited data exposure.

Affected Products

josheli Simple Google Photos Grid plugin for WordPress
All versions from initial release through 1.5
WordPress sites where the plugin is installed and active

Discovery Timeline

2025-04-24 - CVE-2025-46503 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46503

Vulnerability Analysis

The Simple Google Photos Grid plugin accepts user-controlled input that is passed to a server-side HTTP request function without adequate validation of the destination URL. Because the request originates from the WordPress server, it bypasses network perimeter controls that would block equivalent client-side requests. An attacker can direct the server to fetch resources from 127.0.0.1, RFC1918 private ranges, or cloud metadata services such as 169.254.169.254.

The attack requires low-privileged authentication, which limits mass exploitation but remains reachable in multi-user WordPress environments. The scope is changed, meaning the vulnerable component can affect resources beyond its own security boundary.

Root Cause

The root cause is missing or insufficient allowlist validation of URLs supplied to the plugin's HTTP fetch routine. The plugin trusts the URL parameter without verifying that the resolved destination is an approved external endpoint. This maps directly to CWE-918: Server-Side Request Forgery.

Attack Vector

Exploitation proceeds over the network. An authenticated user submits a crafted request to a plugin endpoint that accepts a target URL parameter. The plugin then performs a server-side HTTP request to the attacker-supplied destination. Responses or side effects can reveal information about internal services, open ports, or metadata credentials in cloud environments.

No verified public proof-of-concept code has been released. Technical specifics are documented in the Patchstack SSRF Vulnerability Report.

Detection Methods for CVE-2025-46503

Indicators of Compromise

Outbound HTTP requests from the WordPress PHP worker to internal IP ranges such as 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16
Requests from the web server to cloud metadata endpoints including 169.254.169.254 or metadata.google.internal
Unusual wp-admin/admin-ajax.php or plugin-specific requests referencing external or internal URLs in query parameters
Spike in outbound connections from the web server originating from authenticated low-privilege sessions

Detection Strategies

Inspect web server access logs for authenticated requests to simple-google-photos-grid plugin endpoints carrying URL parameters
Correlate PHP-FPM or Apache egress connections with WordPress user session activity to identify anomalous fetch behavior
Deploy egress network monitoring to flag outbound HTTP traffic destined for private, loopback, or link-local address space

Monitoring Recommendations

Enable WordPress audit logging for plugin activity and low-privilege user actions
Forward web server and PHP logs to a centralized SIEM for correlation with network egress telemetry
Alert on any successful HTTP response from the WordPress host to cloud instance metadata services

How to Mitigate CVE-2025-46503

Immediate Actions Required

Deactivate and remove the Simple Google Photos Grid plugin until a patched release is confirmed available
Audit WordPress user accounts and remove or downgrade unnecessary low-privilege accounts that could reach the vulnerable endpoint
Restrict outbound network access from the WordPress server to only required external destinations

Patch Information

At the time of NVD publication, no fixed version beyond 1.5 has been referenced in the advisory. Administrators should monitor the Patchstack SSRF Vulnerability Report and the plugin's WordPress.org page for a security update.

Workarounds

Block the WordPress server from initiating connections to internal IP ranges and cloud metadata endpoints at the network firewall or host firewall
Deploy a web application firewall rule to inspect and block requests to plugin endpoints containing URL parameters targeting private address space
Enforce least privilege on WordPress roles so untrusted users cannot reach the affected plugin functionality

bash

# Example iptables rule blocking egress to cloud metadata and private ranges from the web server user
iptables -A OUTPUT -m owner --uid-owner www-data -d 169.254.169.254 -j REJECT
iptables -A OUTPUT -m owner --uid-owner www-data -d 10.0.0.0/8 -j REJECT
iptables -A OUTPUT -m owner --uid-owner www-data -d 172.16.0.0/12 -j REJECT
iptables -A OUTPUT -m owner --uid-owner www-data -d 192.168.0.0/16 -j REJECT