Deserialization Vulnerability in Alfresco Activiti Process Variable Serialization System
CVE-2026-3967

5.3MEDIUM

Key Information:

Vendor

Alfresco

Status
Activiti
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3967?

A deserialization vulnerability exists in Alfresco Activiti's Process Variable Serialization System, specifically within the method deserialize/createObjectInputStream in the SerializableType.java file. This flaw allows attackers to exploit the application remotely, potentially leading to unauthorized access and manipulation. The lack of response from the vendor regarding this disclosure adds to the urgency for users to review and mitigate any risks associated with the affected versions of the Activiti platform.

Affected Version(s)

Activiti 7.0

Activiti 7.1

Activiti 7.2

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-2026-3967 - Proof of Concept

References

https://vuldb.com/?id.350396
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350396
signaturepermissions-required
https://vuldb.com/?submit.768942
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

Ana10gy (VulDB User)
VulDB
.