CVE-2026-28036: Ratatouille SSRF Vulnerability

CVE-2026-28036 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in the SkatDesign Ratatouille WordPress theme. This vulnerability allows authenticated attackers to make arbitrary HTTP requests from the vulnerable server, potentially accessing internal services, bypassing firewalls, or scanning internal networks. The flaw exists in versions up to and including 1.2.6 of the Ratatouille theme.

Critical Impact

Attackers with low privileges can exploit this SSRF vulnerability to access internal resources, interact with cloud metadata services, or pivot to other internal systems that are not directly accessible from the internet.

Affected Products

• SkatDesign Ratatouille WordPress Theme versions through <= 1.2.6
• WordPress installations using the vulnerable Ratatouille theme

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-28036 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28036

Vulnerability Analysis

This vulnerability is classified as CWE-918: Server-Side Request Forgery (SSRF). SSRF vulnerabilities occur when an application can be manipulated to make HTTP requests to arbitrary destinations chosen by an attacker. In this case, the Ratatouille WordPress theme contains functionality that can be abused to issue requests to internal or external resources from the server's perspective.

The attack requires network access and low-level authentication (such as a subscriber account on a WordPress site), but no user interaction is needed for exploitation. The vulnerability has a changed scope, meaning the vulnerable component (the theme) can affect resources beyond its security scope, potentially impacting internal infrastructure or cloud services.

Root Cause

The root cause of this vulnerability stems from insufficient validation of user-supplied URLs or input parameters that are subsequently used in server-side HTTP requests. The Ratatouille theme fails to properly sanitize or restrict the destinations of outbound requests, allowing attackers to specify arbitrary URLs including internal network addresses, localhost services, or cloud metadata endpoints.

Attack Vector

The attack is conducted over the network and requires authenticated access to the WordPress installation. An attacker with minimal privileges (such as a subscriber role) can exploit this vulnerability by manipulating input parameters that control URL destinations in server-side requests.

The vulnerability enables several attack scenarios:

1. Internal Service Enumeration: Attackers can probe internal network services that are not exposed to the internet
2. Cloud Metadata Access: On cloud-hosted WordPress instances, attackers may access cloud provider metadata services (e.g., http://169.254.169.254/) to retrieve sensitive credentials or configuration data
3. Firewall Bypass: The server's trusted network position allows requests to bypass firewall rules that would block external attackers
4. Port Scanning: Internal network ports can be scanned to identify running services

For detailed technical information, refer to the Patchstack SSRF Vulnerability Report.

Detection Methods for CVE-2026-28036

Indicators of Compromise

• Unusual outbound HTTP requests from the WordPress server to internal IP ranges (e.g., 10.x.x.x, 172.16.x.x, 192.168.x.x)
• Requests to cloud metadata endpoints such as 169.254.169.254
• Server-side requests to localhost (127.0.0.1) or 0.0.0.0 addresses
• Anomalous traffic patterns from the web server to non-standard ports on internal systems

Detection Strategies

• Monitor web server logs for requests containing internal IP addresses or localhost references in request parameters
• Implement network segmentation monitoring to detect unexpected traffic from web servers to internal services
• Review WordPress authentication logs for suspicious low-privilege account activity followed by SSRF-indicative requests
• Deploy web application firewall (WAF) rules to detect SSRF payloads in request parameters

Monitoring Recommendations

• Enable verbose logging on WordPress and review for unusual theme-related activity
• Configure network monitoring tools to alert on outbound connections from web servers to internal RFC1918 addresses
• Implement egress filtering and log all outbound connections from the WordPress server
• Monitor for access to cloud metadata services if running on cloud infrastructure

How to Mitigate CVE-2026-28036

Immediate Actions Required

• Deactivate and remove the Ratatouille theme if it is not essential to site functionality
• Restrict user registration and audit existing user accounts, removing unnecessary low-privilege accounts
• Implement network-level controls to restrict outbound connections from the WordPress server
• Consider using a WordPress security plugin with SSRF protection capabilities

Patch Information

As of the last update on 2026-03-05, users should check for updates from SkatDesign for a patched version of the Ratatouille theme. Monitor the Patchstack vulnerability database for the latest remediation information and patch availability.

Workarounds

• Switch to an alternative WordPress theme that is actively maintained and does not contain this vulnerability
• Implement a web application firewall (WAF) with SSRF detection rules to block malicious requests
• Apply network segmentation to limit the WordPress server's ability to reach internal services
• Block outbound access to cloud metadata IP ranges (169.254.169.254) from the WordPress server

# Example: Block metadata service access via iptables
iptables -A OUTPUT -d 169.254.169.254 -j DROP

# Example: Restrict outbound connections from web server
iptables -A OUTPUT -m owner --uid-owner www-data -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 192.168.0.0/16 -j DROP