CVE-2026-91853: OS Command Injection in TOTOLINK X5000R
CVE-2026-91853 is a medium severity OS command injection vulnerability in TOTOLINK X5000R version 9.1.0cu.2089_B20211224. It affects the exportOvpn function in the /cgi-bin/cstecgi.cgi endpoint, where manipulation of the 'filetype' argument allows remote attackers to execute arbitrary OS commands. The vulnerability has been publicly disclosed, but no known exploits are reported in the wild. The CVSS 4.0 base score is 5.3, indicating a moderate risk.
AI Analysis
Technical Summary
This vulnerability exists in the exportOvpn handler of TOTOLINK X5000R firmware version 9.1.0cu.2089_B20211224. Specifically, the 'filetype' parameter in the /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user endpoint is improperly sanitized, enabling an attacker to inject OS commands remotely without user interaction or elevated privileges. The flaw could allow execution of arbitrary commands on the device's operating system. The vulnerability has been publicly disclosed, but no active exploitation has been confirmed.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary OS commands on the affected device, potentially leading to unauthorized control or disruption of the device's operation. The vulnerability requires no user interaction and has low complexity to exploit, but limited privileges are needed. The overall impact is moderate given the CVSS score of 5.3.
Mitigation Recommendations
No official patch or vendor advisory is currently available for this vulnerability. Patch status is not yet confirmed — check the TOTOLINK vendor advisory for current remediation guidance. Until a fix is released, restrict access to the affected endpoint and consider network-level controls to limit exposure.
CVE-2026-91853: OS Command Injection in TOTOLINK X5000R
Description
CVE-2026-91853 is a medium severity OS command injection vulnerability in TOTOLINK X5000R version 9.1.0cu.2089_B20211224. It affects the exportOvpn function in the /cgi-bin/cstecgi.cgi endpoint, where manipulation of the 'filetype' argument allows remote attackers to execute arbitrary OS commands. The vulnerability has been publicly disclosed, but no known exploits are reported in the wild. The CVSS 4.0 base score is 5.3, indicating a moderate risk.
CVSS v4.0
Score 5.3medium
Affected software
TOTOLINK
X5000R
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability exists in the exportOvpn handler of TOTOLINK X5000R firmware version 9.1.0cu.2089_B20211224. Specifically, the 'filetype' parameter in the /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user endpoint is improperly sanitized, enabling an attacker to inject OS commands remotely without user interaction or elevated privileges. The flaw could allow execution of arbitrary commands on the device's operating system. The vulnerability has been publicly disclosed, but no active exploitation has been confirmed.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary OS commands on the affected device, potentially leading to unauthorized control or disruption of the device's operation. The vulnerability requires no user interaction and has low complexity to exploit, but limited privileges are needed. The overall impact is moderate given the CVSS score of 5.3.
Mitigation Recommendations
No official patch or vendor advisory is currently available for this vulnerability. Patch status is not yet confirmed — check the TOTOLINK vendor advisory for current remediation guidance. Until a fix is released, restrict access to the affected endpoint and consider network-level controls to limit exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-15T09:03:34.562Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa96f8255bf5e2cf510d8b4
Added to database: 09/15/2026, 16:17:06 UTC
Last enriched: 09/15/2026, 16:31:34 UTC
Last updated: 09/15/2026, 16:36:18 UTC
Views: 5
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