Incorrect access control in the setWanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter upstream… (CVE-2026-51690)
Description
An incorrect access control vulnerability exists in the setWanCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. This flaw allows unauthenticated attackers to modify upstream provisioning and connectivity by sending a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015 contains an access control vulnerability in the setWanCfg function. This vulnerability permits unauthenticated attackers to alter upstream network configuration parameters by submitting a specially crafted POST request to the /cgi-bin/cstecgi.cgi CGI endpoint. No CVSS score or detailed impact metrics are provided. No patch or remediation information is available from the source data.
Potential Impact
Successful exploitation allows unauthenticated attackers to change upstream provisioning and connectivity settings on the affected device. This could lead to network disruption or unauthorized network configuration changes. There is no information about active exploitation in the wild or further impact details.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the device's management interface and monitor for suspicious POST requests targeting /cgi-bin/cstecgi.cgi.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4wrw-r87c-p2q9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-51690"]
Threat ID: 6a95befeacd9273b496676dc
Added to database: 08/31/2026, 17:50:54 UTC
Last enriched: 09/08/2026, 16:23:18 UTC
Last updated: 10/15/2026, 06:48:16 UTC
Views: 69
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