Server-Side Request Forgery Vulnerability in projeto-siga by projeto-siga
CVE-2026-86273

6.9MEDIUM

Key Information:

Vendor

Projeto-siga

Status
Siga
Vendor
CVE Published:
7 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86273?

A security weakness has been discovered in the projeto-siga software, particularly affecting the HTML-to-PDF endpoint. The flaw lies in the function DownloadExterno.getUrl, located in the ExUtilController.java file. This vulnerability allows remote attackers to perform server-side request forgery (SSRF), potentially exposing sensitive server data or facilitating further attacks. Despite being notified of the issue through an issue report, the project has yet to respond or release a patch. Affected versions range from 5.4.10 to 11.1.1.

Affected Version(s)

siga 11.1.0

siga 11.1.1

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-2026-86273 - Proof of Concept

References

https://vuldb.com/vuln/399434
vdb-entrytechnical-description
https://vuldb.com/vuln/399434/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86273
third-party-advisory

CVSS V4

Score:
6.9
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

volksec (VulDB User)
VulDB CNA Team
.