OS Command Injection Vulnerability in TOTOLINK X5000R Router
CVE-2026-91853

5.3MEDIUM

Key Information:

Vendor

Totolink
Status
X5000r
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91853?

A security flaw has been identified in the TOTOLINK X5000R router that allows remote attackers to execute arbitrary operating system commands. This vulnerability arises from insufficient input validation in the exportOvpn function within the Export Ovpn Handler component. By manipulating the 'filetype' parameter in a crafted request to /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user, an attacker can exploit this weakness to gain unauthorized access and execute commands on the system. Given that the vulnerability has been publicly disclosed, it poses a significant risk to users if left unaddressed.

Affected Version(s)

X5000R 9.1.0cu.2089_B20211224

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-2026-91853 - Proof of Concept

References

https://vuldb.com/vuln/404082
vdb-entrytechnical-description
https://vuldb.com/vuln/404082/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-91853
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

awigwu76 (VulDB User)
.