XML External Entity Injection Vulnerability in opencc JFlow Workflow Engine
CVE-2026-2536

5.3MEDIUM

Key Information:

Vendor

Opencc

Status
Jflow
Vendor
CVE Published:
16 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2536?

A vulnerability has been identified in the opencc JFlow Workflow Engine prior to version 20260129. This issue originates from mishandling XML inputs in the WF_Admin_AttrFlow.java component, particularly within the Imp_Done function. The flaw allows for XML External Entity (XXE) references to be exploited, potentially enabling unauthorized remote attacks. This vulnerability has been publicly disclosed, and although the project team has been notified, no fix has been released to date.

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Affected Version(s)

JFlow 20260129

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-2026-2536 - Proof of Concept

References

https://vuldb.com/?id.346124
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346124
signaturepermissions-required
https://vuldb.com/?submit.748807
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

MaoQiu (VulDB User)
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