CVE-2026-51723: n/a
Description
Incorrect access control in the UploadCustomModule function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to install a custom CGI module 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 UploadCustomModule function of TOTOLINK T6 4.1.5cu.748_B20211015. An attacker can exploit this by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, enabling the installation of a custom CGI module without authentication. The CVSS 3.1 base score is 9.1, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality and integrity. No official patch or remediation guidance is currently available.
Potential Impact
Successful exploitation allows unauthenticated attackers to install arbitrary CGI modules on the device, potentially leading to full compromise of device confidentiality and integrity. This could enable attackers to execute arbitrary code or manipulate device behavior without authorization.
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 affected device, especially to the /cgi-bin/cstecgi.cgi endpoint, and monitor for suspicious POST requests targeting this URI.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a95b4e5acd9273b495cdc8b
Added to database: 08/31/2026, 17:07:49 UTC
Last enriched: 09/07/2026, 13:42:37 UTC
Last updated: 10/13/2026, 18:48:21 UTC
Views: 31
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