CVE-2026-57413 Overview
CVE-2026-57413 is a Server-Side Request Forgery (SSRF) vulnerability in the bdthemes Instant Image Generator (ai-image) WordPress plugin. The flaw affects all versions up to and including 2.1.4. An authenticated attacker with low privileges can coerce the WordPress server to issue arbitrary HTTP requests to internal or external destinations. This maps to CWE-918: Server-Side Request Forgery.
Critical Impact
Attackers can leverage the vulnerable WordPress host to reach internal network services, cloud metadata endpoints, or third-party systems that trust the server's originating IP address.
Affected Products
- bdthemes Instant Image Generator (ai-image) plugin for WordPress
- All versions from n/a through 2.1.4
- WordPress installations with the plugin activated
Discovery Timeline
- 2026-07-13 - CVE-2026-57413 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57413
Vulnerability Analysis
The Instant Image Generator plugin exposes functionality that accepts user-supplied URLs and fetches remote resources server-side. The plugin fails to validate or restrict the destination host, scheme, or IP range before initiating the outbound request. An authenticated user with minimal privileges can submit URLs pointing to internal-only endpoints. The server-side fetcher then executes the request from the trusted WordPress host context.
SSRF in a WordPress plugin context is particularly relevant in shared hosting and cloud deployments. Attackers commonly target cloud instance metadata services to retrieve credentials, or probe internal services that reject direct external connections. The scope-changed CVSS vector indicates the impact extends beyond the vulnerable component to systems reachable from the WordPress host.
Root Cause
The root cause is missing validation of user-controlled URL input before it is passed to a server-side HTTP client. The plugin does not enforce an allowlist of destination hosts, does not block private IP ranges (RFC 1918), and does not reject non-HTTP schemes. This is a classic implementation of CWE-918.
Attack Vector
Exploitation requires network access and a low-privileged authenticated WordPress account. The attacker submits a crafted request to the plugin endpoint containing a URL parameter pointing to an internal or sensitive target. The server retrieves the resource and, depending on the plugin's response handling, may return content or leak metadata back to the attacker. Reference details are available in the Patchstack SSRF Vulnerability Advisory.
No verified public exploit code is available. The vulnerability manifests when the plugin's image generation feature passes attacker-controlled URLs to an internal fetch routine without validation.
Detection Methods for CVE-2026-57413
Indicators of Compromise
- Outbound HTTP requests from the WordPress host to internal RFC 1918 addresses, 127.0.0.1, or 169.254.169.254 cloud metadata endpoints
- Unexpected requests originating from the PHP process to non-standard ports on internal hosts
- Access log entries showing authenticated calls to ai-image plugin endpoints followed by anomalous outbound traffic
- WordPress user accounts with contributor or higher roles making repeated requests to image generation endpoints
Detection Strategies
- Monitor egress traffic from web servers and alert on connections to private IP ranges or cloud metadata IPs
- Inspect WordPress access logs for POST requests to plugin endpoints containing URL parameters with suspicious destinations
- Correlate authenticated user actions with outbound HTTP requests from the PHP-FPM or Apache worker processes
- Deploy web application firewall rules that inspect URL parameters submitted to wp-admin/admin-ajax.php calls tied to the plugin
Monitoring Recommendations
- Ingest WordPress and web server logs into a centralized data lake for correlation and retention
- Alert on any process on the WordPress host attempting to reach 169.254.169.254 or link-local addresses
- Track plugin version inventory across WordPress fleets to identify vulnerable installations of ai-image at or below 2.1.4
How to Mitigate CVE-2026-57413
Immediate Actions Required
- Identify all WordPress sites running the bdthemes Instant Image Generator plugin at version 2.1.4 or earlier
- Deactivate the plugin until a patched release is confirmed and installed
- Audit low-privileged WordPress accounts for suspicious activity and rotate credentials where necessary
- Restrict outbound network access from WordPress hosts to only required destinations
Patch Information
As of the CVE publication date, the Patchstack advisory lists all versions through 2.1.4 as affected. Administrators should monitor the vendor for a fixed release beyond 2.1.4 and apply it immediately once available.
Workarounds
- Block outbound requests from the WordPress host to internal networks and cloud metadata endpoints using host firewall rules
- Enforce IMDSv2 on AWS EC2 instances to prevent credential theft through SSRF
- Restrict which WordPress roles can access plugin functionality via capability plugins or custom role management
- Deploy a web application firewall rule that rejects requests containing URL parameters pointing to private IP ranges
# Example iptables rules to block WordPress host egress to private ranges
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
iptables -A OUTPUT -m owner --uid-owner www-data -d 169.254.0.0/16 -j REJECT
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
