CVE-2026-51691: n/a
Description
Incorrect access control in the setUploadSetting function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to manipulate the upload or flash workflow via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper access control in the setUploadSetting function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. An unauthenticated attacker can exploit this by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, enabling manipulation of the upload or flash workflow. The CVSS v3.1 score is 9.8 (critical), reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. No patch or official remediation information is currently available.
Potential Impact
Successful exploitation allows unauthenticated attackers to manipulate firmware upload or flashing processes, potentially leading to full device compromise including unauthorized code execution, persistent control, and disruption of device functionality.
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. Avoid exposing the device management interface to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a9598c7acd9273b493e4a4c
Added to database: 08/31/2026, 15:07:51 UTC
Last enriched: 09/07/2026, 13:42:21 UTC
Last updated: 10/14/2026, 18:48:21 UTC
Views: 51
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