CVE-2025-31796: ElementsCSS Addons SSRF Vulnerability

CVE-2025-31796 Overview

CVE-2025-31796 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] affecting the TheInnovs ElementsCSS Addons for Elementor WordPress plugin. The flaw exists in the css-for-elementor plugin and impacts all versions up to and including 1.0.8.9. An unauthenticated attacker can coerce the vulnerable WordPress site to issue arbitrary HTTP requests to internal or external resources. Successful exploitation exposes internal network services, cloud metadata endpoints, and other resources that would normally be inaccessible from the internet.

Critical Impact
Unauthenticated attackers can leverage the vulnerable WordPress server as a proxy to probe internal networks, access cloud metadata services, or interact with services shielded behind perimeter firewalls.

Affected Products

TheInnovs ElementsCSS Addons for Elementor (css-for-elementor)
All versions from n/a through 1.0.8.9
WordPress sites running Elementor with this add-on installed

Discovery Timeline

2025-04-01 - CVE-2025-31796 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31796

Vulnerability Analysis

The vulnerability resides in the ElementsCSS Addons for Elementor plugin, which extends the Elementor page builder with additional CSS-related capabilities. The plugin accepts user-controllable URL input and passes it to a server-side HTTP request function without proper validation or allow-list enforcement. This allows an unauthenticated remote attacker to instruct the WordPress server to fetch arbitrary URLs on the attacker's behalf. Because the request originates from the server, it bypasses network segmentation controls that would ordinarily block external clients.

The scope of the flaw is classified as changed, meaning the vulnerable component can affect resources beyond its own security scope, such as internal services or adjacent cloud infrastructure. Both confidentiality and integrity impacts are limited, but the ability to reach internal endpoints makes this a useful pivot primitive during multi-stage attacks.

Root Cause

The root cause is missing or insufficient validation of URL parameters supplied to a server-side fetching routine. The plugin does not restrict the destination host, scheme, or port before initiating an outbound HTTP request. Standard SSRF defenses such as allow-lists, blocking of loopback and private IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.169.254), and DNS rebinding protection are absent.

Attack Vector

An unauthenticated attacker sends a crafted HTTP request to the vulnerable plugin endpoint containing a URL pointing to an internal resource. The WordPress server dispatches the request and, depending on the code path, may return the response content to the attacker. Attack complexity is elevated because certain conditions must be met to trigger the vulnerable code path.

Common SSRF exploitation targets include cloud provider metadata endpoints such as http://169.254.169.254/latest/meta-data/ on AWS, internal administrative interfaces bound to loopback, and unauthenticated services on private VLANs. Refer to the Patchstack SSRF Vulnerability Advisory for technical details.

Detection Methods for CVE-2025-31796

Indicators of Compromise

Outbound HTTP requests from the WordPress host to internal IP ranges or 169.254.169.254
Unexpected User-Agent strings originating from PHP or WordPress HTTP libraries targeting internal services
Web server access logs showing requests to plugin endpoints containing full URLs in query parameters or POST bodies
Anomalous DNS resolutions for internal hostnames initiated by the WordPress server process

Detection Strategies

Inspect WordPress access logs for requests referencing css-for-elementor plugin paths with URL-like parameters
Correlate web application requests with outbound network flows from the WordPress server to detect proxied traffic
Deploy a web application firewall rule that inspects request parameters for URLs targeting private IP space or metadata endpoints
Alert on requests to cloud metadata IPs originating from any web application host

Monitoring Recommendations

Enable egress traffic logging on WordPress hosts and forward events to a centralized analytics platform
Monitor for spikes in outbound HTTP connections that do not correspond to normal plugin update or telemetry activity
Track plugin version inventory across WordPress deployments to identify vulnerable css-for-elementor installations
Review DNS query logs for lookups of internal-only hostnames sourced from web servers

How to Mitigate CVE-2025-31796

Immediate Actions Required

Identify all WordPress sites running the ElementsCSS Addons for Elementor plugin at version 1.0.8.9 or earlier
Deactivate and remove the plugin until a patched release is confirmed installed
Restrict outbound network access from WordPress servers to only required destinations
Block WordPress server access to cloud metadata endpoints and internal management ranges

Patch Information

At the time of NVD publication, a fixed version had not been enumerated in the CVE record. Consult the Patchstack SSRF Vulnerability Advisory and the plugin vendor for the latest release. Upgrade to any version released after 1.0.8.9 once available and verify the SSRF fix is included.

Workarounds

Apply Patchstack virtual patching or an equivalent WAF ruleset that blocks SSRF payloads targeting the plugin
Configure egress firewall rules denying WordPress hosts from initiating connections to RFC1918 ranges and 169.254.169.254
Use IMDSv2 with session tokens on AWS to prevent metadata theft via SSRF
Enforce PHP-level restrictions on allow_url_fopen and outbound HTTP wrappers where feasible

bash

# Example iptables egress restriction on a WordPress host
iptables -A OUTPUT -d 169.254.169.254 -j DROP
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -d 127.0.0.0/8 ! -o lo -j DROP