# CVE-2026-11437: perfree go-fastdfs-web SSRF in Installation Endpoint

Source: https://junglewise.ai/threats/cve-2026-11437-perfree-go-fastdfs-web-ssrf-in-installation-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-06. Updated: 2026-06-06  
License: CC BY 4.0 with a link back

CVE-2026-11437 · Severity: high · CVSS 7.3 · Published 2026-06-06

A security vulnerability exists in the installation component of perfree go-fastdfs-web, a web-based management interface for the fastdfs distributed file system. An attacker can exploit this flaw to force the server to make unauthorized requests to internal or external network resources. This could lead to the exposure of sensitive internal data or allow the attacker to bypass network security controls to reach other systems.

Vendors: [Perfree](https://junglewise.ai/threats/vendors/perfree).

## Quick answers

**Is CVE-2026-11437 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11437 being exploited in the wild.

**How severe is CVE-2026-11437?** High severity, with a CVSS score of 7.3, published 6 June 2026.

**Which products and versions are affected?** Perfree Go-Fastdfs-Web up to 1.3.7.

**Is there a fix for CVE-2026-11437?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-11437 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-11437?** Check whether you run Perfree Go-Fastdfs-Web at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in perfree go-fastdfs-web versions up to and including 1.3.7. The flaw is located in the 'checkServer' function within the '/install/checkServer' file of the Installation Endpoint component. A remote, unauthenticated attacker can provide malicious input to this function, causing the server to initiate network requests to arbitrary locations. This can be used to scan internal networks, access local services, or exfiltrate data. A public exploit has been disclosed, and as of the advisory date, the vendor has not responded to reports of the vulnerability.

## Affected products

- perfree go-fastdfs-web up to 1.3.7

## Timeline

- 2026-06-06: disclosed: Vulnerability disclosed via VulDB and NVD
- 2026-06-06: advisory

## References

- [https://vuldb.com/cve/CVE-2026-11437](https://vuldb.com/cve/CVE-2026-11437)
- [https://vuldb.com/submit/822726](https://vuldb.com/submit/822726)
- [https://vuldb.com/vuln/369017](https://vuldb.com/vuln/369017)
- [https://vuldb.com/vuln/369017/cti](https://vuldb.com/vuln/369017/cti)
- [https://www.notion.so/Server-Side-Request-Forgery-SSRF-in-go-fastdfs-web-Installation-Endpoint-35aea92a3c41806485ffeeac7e18126a](https://www.notion.so/Server-Side-Request-Forgery-SSRF-in-go-fastdfs-web-Installation-Endpoint-35aea92a3c41806485ffeeac7e18126a)