Improper Authentication in SuiteNumerique Messages 0.2.0 by SuiteNumerique
CVE-2026-3739

5.3MEDIUM

Key Information:

Vendor

Suitenumerique

Status
Messages
Vendor
CVE Published:
8 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3739?

A security flaw has been identified in SuiteNumerique Messages version 0.2.0, specifically within the ThreadAccessSerializer in the file src/backend/core/api/serializers.py. This vulnerability permits improper authentication, potentially allowing unauthorized remote access to system functions. Attackers can exploit this flaw using methods that have been publicly disclosed. To remedy this issue, users are advised to upgrade to version 0.3.0, which contains the necessary patch (commit d7729f4b885449f6dee3faf8b5f2a05769fb3d6e).

Affected Version(s)

messages 0.2.0

messages 0.3.0

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-2026-3739 - Proof of Concept

References

https://vuldb.com/?id.349717
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349717
signaturepermissions-required
https://vuldb.com/?submit.767329
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

djnn (VulDB User)
.