Authenticated Access Vulnerability in sdcb chats by sdcb
CVE-2026-82906

6.3MEDIUM

Key Information:

Vendor

Sdcb

Status
Chats
Vendor
CVE Published:
31 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82906?

A significant security flaw has been identified in sdcb chats versions up to 1.12.0. This vulnerability affects the DownloadPublic function within the Signed File Download Endpoint, specifically in the FileController.cs file. The issue arises due to inadequate authentication checks, allowing unauthorized access to sensitive files. Attackers can exploit this vulnerability remotely, enabling them to manipulate file downloads without proper authorization. The complexity of executing this attack is rated as high, making it a pressing concern for users of sdcb chats. Despite early notification to the vendor about this issue, there has been no response or remediation provided.

Affected Version(s)

chats 1.0

chats 1.1

chats 1.2

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-2026-82906 - Proof of Concept

References

https://vuldb.com/vuln/397286
vdb-entrytechnical-description
https://vuldb.com/vuln/397286/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82906
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

yaowenxiao (VulDB User)
VulDB CNA Team
.