Security Flaw in Go-FastDFS-Web Product by Perfree
CVE-2026-3963

6.3MEDIUM

Key Information:

Vendor

Perfree

Status
Go-fastdfs-web
Vendor
CVE Published:
11 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3963?

A security flaw has been identified in the Perfrees's go-fastdfs-web application, specifically in the rememberMeManager function located in ShiroConfig.java. This vulnerability involves a hard-coded cryptographic key, which could allow remote attackers to exploit the system. Although the complexity required to carry out an attack is relatively high, the public release of the exploit increases the risk of misuse. The vendor was contacted regarding this issue but has not provided a response.

Affected Version(s)

go-fastdfs-web 1.3.0

go-fastdfs-web 1.3.1

go-fastdfs-web 1.3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3963 - Proof of Concept

References

https://vuldb.com/?id.350392
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350392
signaturepermissions-required
https://vuldb.com/?submit.768282
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

din4 (VulDB User)
VulDB
.