CVE-2026-82852 Overview
CVE-2026-82852 is an unauthenticated Server-Side Request Forgery (SSRF) vulnerability affecting the MapSVG WordPress plugin in versions up to and including 8.15.0. The flaw allows remote attackers to coerce the vulnerable WordPress server into issuing HTTP requests to attacker-chosen destinations without any authentication. Successful abuse can expose internal network services, cloud metadata endpoints, or other resources normally unreachable from the public internet. The vulnerability is classified under CWE-918: Server-Side Request Forgery.
Critical Impact
Unauthenticated attackers can pivot through vulnerable WordPress sites to probe internal networks, access cloud metadata services, and disclose limited confidentiality and integrity data across trust boundaries.
Affected Products
- MapSVG Lite Interactive Vector Maps WordPress plugin
- All plugin versions up to and including 8.15.0
- WordPress installations with MapSVG enabled and network-accessible
Discovery Timeline
- 2026-08-31 - CVE-2026-82852 published to NVD
- 2026-09-02 - Last updated in NVD database
Technical Details for CVE-2026-82852
Vulnerability Analysis
The vulnerability resides in the MapSVG plugin's handling of user-supplied URLs passed to server-side HTTP client functionality. The plugin retrieves remote content on behalf of the caller but fails to validate or restrict the destination before issuing the outbound request. Because the endpoint does not require authentication, any anonymous visitor can trigger the request.
Exploitation follows the standard SSRF pattern documented under CWE-918. An attacker submits a crafted URL parameter that points to an internal-only resource, such as http://127.0.0.1, http://169.254.169.254/latest/meta-data/ on AWS, or an internal service on http://10.0.0.0/8. The WordPress server, trusted inside the network perimeter, performs the request and may return response data, headers, or timing signals to the attacker.
Root Cause
The root cause is missing allow-list validation on the destination URL parameter before it is passed to the server-side HTTP fetch routine. Common contributing factors include acceptance of arbitrary schemes, missing DNS pinning against private address ranges, and no restriction to a fixed set of external hosts required for map tile retrieval.
Attack Vector
The attack vector is remote and unauthenticated over HTTP or HTTPS. An attacker sends a single crafted request to the vulnerable MapSVG endpoint on a public WordPress site. High attack complexity reflects conditions such as network segmentation, response filtering, or reliance on blind SSRF techniques. The scope change indicates that impact can cross trust boundaries into backend services distinct from the WordPress host itself.
No verified proof-of-concept has been published. Refer to the Patchstack SSRF Vulnerability Report for advisory details.
Detection Methods for CVE-2026-82852
Indicators of Compromise
- Unexpected outbound HTTP requests from the WordPress server to internal RFC1918 ranges or 169.254.169.254.
- Access log entries targeting MapSVG plugin endpoints under /wp-content/plugins/mapsvg-lite-interactive-vector-maps/ with external URL parameters.
- Anomalous DNS lookups originating from the WordPress host to attacker-controlled domains used for out-of-band SSRF confirmation.
Detection Strategies
- Inspect web server access logs for unauthenticated requests to MapSVG endpoints containing url=, src=, or similar parameters referencing non-map hosts.
- Correlate WordPress process network telemetry against expected egress destinations and alert on requests to link-local, loopback, or private ranges.
- Deploy web application firewall rules that block URL parameters resolving to internal addresses when passed to plugin endpoints.
Monitoring Recommendations
- Enable egress logging on hosts running WordPress and forward it to a centralized analytics platform for baseline deviation review.
- Monitor cloud metadata endpoint access (169.254.169.254) from any workload not explicitly designed to query it.
- Track plugin version inventory across WordPress fleets and alert when MapSVG <= 8.15.0 is detected.
How to Mitigate CVE-2026-82852
Immediate Actions Required
- Update MapSVG to a version later than 8.15.0 once a patched release is confirmed by the vendor.
- If no fixed version is available, disable or uninstall the MapSVG plugin on production WordPress sites.
- Restrict outbound network access from WordPress hosts so they cannot reach internal management interfaces or cloud metadata services.
Patch Information
No fixed version is referenced in the current NVD entry. Administrators should consult the Patchstack SSRF Vulnerability Report and the plugin's WordPress.org page for the latest release status before upgrading.
Workarounds
- Place WordPress behind a forward proxy that enforces an allow-list of legitimate map tile providers and blocks private address ranges.
- Apply Instance Metadata Service v2 (IMDSv2) with hop-limit 1 on AWS workloads to prevent SSRF-based credential theft from cloud metadata.
- Add web application firewall signatures that reject requests to MapSVG endpoints containing URL parameters pointing to internal, loopback, or link-local addresses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
