CVE-2026-11437: perfree go-fastdfs-web Installation Endpoint checkServer server-side request forgery

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-06 · updated 2026-07-23
Weakness: CWE-918

Description

A flaw has been found in perfree go-fastdfs-web up to 1.3.7. Affected is the function checkServer of the file /install/checkServer of the component Installation Endpoint. Executing a manipulation can lead to server-side request forgery. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

perfree go-fastdfs-web: 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5 (+2)

References

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

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