Authorization Bypass in projeto-siga Affects Multiple Versions
CVE-2026-86274

6.9MEDIUM

Key Information:

Vendor

Projeto-siga

Status
Siga
Vendor
CVE Published:
7 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86274?

A vulnerability has been identified in the Authentication Flow of projeto-siga affecting versions up to 11.0.2.10, 11.0.2.13, and 11.1.1. The flaw resides in the ExAutenticacaoController.autenticar function, where improper handling of the cod/jwt argument can lead to unauthorized access. This issue can be exploited remotely, allowing attackers to bypass critical authorization protocols. Despite prior notification through an issue report, the project has not addressed the vulnerability publicly.

Affected Version(s)

siga 11.0.2.0

siga 11.0.2.1

siga 11.0.2.2

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-2026-86274 - Proof of Concept

References

https://vuldb.com/vuln/399435
vdb-entrytechnical-description
https://vuldb.com/vuln/399435/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86274
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
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

volksec (VulDB User)
VulDB CNA Team
.