CVE-2026-51689: n/a
Description
Incorrect access control in the setUpgradeFW function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to trigger firmware-upgrade workflow changes via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper access control in the setUpgradeFW function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. An unauthenticated attacker can send a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint to trigger unauthorized changes in the firmware upgrade workflow. The CVSS 3.1 score is 9.1, reflecting a network attack vector with no privileges or user interaction required, resulting in high impact on integrity and availability. No patch or official remediation guidance is currently provided.
Potential Impact
Successful exploitation allows an unauthenticated attacker to alter the firmware upgrade process, potentially leading to unauthorized firmware installation or denial of service. This compromises the integrity and availability of the affected device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a 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
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a9591ceacd9273b49360690
Added to database: 08/31/2026, 14:38:06 UTC
Last enriched: 09/07/2026, 13:42:11 UTC
Last updated: 10/15/2026, 18:48:21 UTC
Views: 79
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