CVE-2025-47437 Overview
CVE-2025-47437 is a Server-Side Request Forgery (SSRF) vulnerability in the LiteSpeed Technologies LiteSpeed Cache plugin for WordPress. The flaw affects all versions up to and including 7.0.1. An authenticated attacker with low privileges can coerce the vulnerable WordPress instance to issue arbitrary HTTP requests to attacker-chosen destinations. The vulnerability is tracked under CWE-918: Server-Side Request Forgery.
Critical Impact
Attackers holding low-privilege WordPress accounts can pivot through the site to reach internal network services, cloud metadata endpoints, or third-party systems, exposing sensitive data and enabling further internal reconnaissance.
Affected Products
- LiteSpeed Technologies LiteSpeed Cache plugin for WordPress
- All versions from unspecified initial release through 7.0.1
- WordPress sites running the vulnerable litespeed-cache plugin
Discovery Timeline
- 2025-09-09 - CVE-2025-47437 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-47437
Vulnerability Analysis
The LiteSpeed Cache plugin contains functionality that fetches remote resources based on user-controllable input. The plugin fails to validate or restrict destination URLs supplied through authenticated requests. As a result, the plugin issues outbound HTTP requests to arbitrary hosts and ports specified by the attacker.
SSRF flaws in WordPress plugins are consequential because the web server often resides in a trusted network segment. Attackers use the vulnerable server as a proxy to reach services otherwise unreachable from the internet. Common targets include cloud instance metadata services, internal administrative panels, and unauthenticated intranet APIs.
The issue requires authentication, which limits opportunistic mass exploitation. However, WordPress sites with open registration or with contributor-level accounts remain exposed. Refer to the Patchstack advisory for coordinated disclosure details.
Root Cause
The root cause is missing input validation on URL parameters processed by the plugin's remote-fetch handlers. The plugin accepts a user-supplied URL and passes it to WordPress HTTP client routines without enforcing an allowlist, blocking private IP ranges, or restricting protocol schemes. This maps directly to CWE-918.
Attack Vector
An attacker authenticates to the WordPress site with a low-privilege account. The attacker then submits a crafted request to a vulnerable plugin endpoint, specifying a destination URL such as an internal IP address, localhost service, or cloud metadata endpoint like http://169.254.169.254/latest/meta-data/. The plugin issues the outbound HTTP request from the server context. Response data or timing side channels leak information about internal infrastructure.
No public proof-of-concept exploit code is available. The vulnerability mechanism is described in prose per the referenced advisory.
Detection Methods for CVE-2025-47437
Indicators of Compromise
- Unexpected outbound HTTP requests originating from the WordPress web server process to internal IP ranges (RFC1918) or link-local addresses such as 169.254.169.254.
- Web server access logs showing authenticated requests to LiteSpeed Cache plugin endpoints containing URL parameters pointing to non-public hosts.
- Anomalous DNS queries from the WordPress host resolving internal hostnames or cloud metadata domains.
Detection Strategies
- Inspect WordPress access logs for requests to /wp-admin/admin-ajax.php and LiteSpeed Cache action handlers carrying suspicious url or similar parameters.
- Correlate authenticated low-privilege user sessions with outbound network activity from the web server to detect pivoting behavior.
- Deploy a web application firewall (WAF) rule that flags URL parameter values referencing private address ranges or metadata IPs.
Monitoring Recommendations
- Monitor egress traffic from WordPress hosts and alert on connections to internal subnets, 127.0.0.1, and cloud metadata endpoints.
- Enable audit logging for LiteSpeed Cache plugin actions and review low-privilege account activity for anomalous parameter values.
- Track version deployment across managed WordPress sites and flag hosts still running litespeed-cache version 7.0.1 or earlier.
How to Mitigate CVE-2025-47437
Immediate Actions Required
- Update the LiteSpeed Cache plugin to the version released after 7.0.1 that addresses this SSRF vulnerability.
- Audit WordPress user accounts and remove or downgrade unnecessary low-privilege access, and disable open user registration where feasible.
- Restrict outbound network access from WordPress hosts to only required destinations using firewall egress rules.
Patch Information
LiteSpeed Technologies has addressed the issue in a version subsequent to 7.0.1. Administrators should consult the Patchstack advisory and the LiteSpeed Cache plugin changelog on the WordPress plugin repository for the fixed release version.
Workarounds
- Block egress traffic from the WordPress server to internal IP ranges, 169.254.169.254, and other cloud metadata endpoints at the network firewall.
- Deploy WAF rules that reject requests to LiteSpeed Cache endpoints containing URL parameters referencing private or reserved address space.
- Temporarily deactivate the LiteSpeed Cache plugin if patching cannot be completed within the required timeframe.
# Example iptables egress restriction blocking access to cloud metadata service
iptables -A OUTPUT -m owner --uid-owner www-data -d 169.254.169.254 -j DROP
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
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.