CVE-2026-91853
Received Received - Intake

Command Injection in TOTOLINK X5000R

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulDB

Description
A vulnerability has been found in TOTOLINK X5000R 9.1.0cu.2089_B20211224. The impacted element is the function exportOvpn of the file /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user of the component Export Ovpn Handler. The manipulation of the argument filetype leads to os command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91853
EUVD
EUVD-2026-78822

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink x5000r 9.1.0cu.2089_b20211224

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

CVE-2026-91853 is an OS command injection flaw in TOTOLINK X5000R router firmware v9.1.0cu.2089_B20211224. The vulnerability exists in the exportOvpn handler of the cstecgi.cgi component. When the filetype parameter is manipulated, attackers can inject shell commands to execute arbitrary code on the device with the privileges of the vulnerable process.

Detection Guidance

To detect this vulnerability, check if your TOTOLINK X5000R router is running firmware version v9.1.0cu.2089_B20211224. Test for OS command injection by sending a crafted request to the vulnerable endpoint: /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user&filetype=gz;ls;. If the router executes arbitrary commands, it is vulnerable.

Use network scanning tools like Nmap to identify vulnerable devices by checking for open ports and firmware versions. Monitor logs for unusual command execution patterns.

Impact Analysis

This vulnerability allows remote attackers to execute arbitrary commands on the affected router. An attacker could gain control of the device, steal sensitive data, modify configurations, or use the router as a pivot point to attack other systems on the network. The impact depends on the router's network exposure and the privileges of the cstecgi.cgi process.

Mitigation Strategies

Immediately update the TOTOLINK X5000R firmware to the latest patched version. If no patch is available, disable remote access to the router's web interface and restrict network access to trusted IPs only.

Apply network-level mitigations such as firewalls to block malicious requests targeting the vulnerable endpoint. Regularly monitor for suspicious activity and unauthorized command executions.

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