Server-Side Request Forgery in FlowCI Flow-Core-X Affects SMTP Host Handler
CVE-2026-4215

5.3MEDIUM

Key Information:

Vendor

Flowci

Status
Flow-core-x
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4215?

A security flaw has been identified in FlowCI's flow-core-x, specifically within the SMTP Host Handler's Save function. This vulnerability allows attackers to perform server-side request forgery (SSRF), enabling them to interact with internal services on the server from a remote location. The flaw has been made public, posing significant risks of exploitation, especially since the vendor has not responded to early disclosure attempts.

Affected Version(s)

flow-core-x 1.23.01

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-2026-4215 - Proof of Concept

References

https://vuldb.com/?id.351139
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351139
signaturepermissions-required
https://vuldb.com/?submit.770491
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

fakebug (VulDB User)
VulDB
.