Incorrect access control in the discoverWan function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to trigger WAN discovery… (CVE-2026-51742)
Description
An incorrect access control vulnerability exists in the discoverWan function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. This flaw allows unauthenticated attackers to trigger the WAN discovery logic by sending a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint. The vulnerability has a CVSS 3.1 base score of 5.9, indicating a medium severity level with high confidentiality impact but no integrity or availability impact.
CVSS v3.1
Score 5.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-51742 is an access control vulnerability in the discoverWan function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. The flaw permits unauthenticated remote attackers to invoke WAN discovery logic via a crafted POST request to /cgi-bin/cstecgi.cgi. This improper access control (CWE-284) could lead to unauthorized information disclosure related to WAN configuration. The vulnerability has a CVSS 3.1 score of 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating network attack vector, high attack complexity, no privileges required, no user interaction, unchanged scope, high confidentiality impact, and no impact on integrity or availability.
Potential Impact
Successful exploitation allows unauthenticated attackers to trigger WAN discovery logic, potentially exposing sensitive WAN configuration information. There is no indication of integrity or availability impact. No known exploits are reported in the wild.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, restrict access to the device management interface from untrusted networks to reduce exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fhqw-9mv9-g6cr
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-51742"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a98458dacd9273b496adda4
Added to database: 09/02/2026, 15:49:33 UTC
Last enriched: 09/07/2026, 21:08:45 UTC
Last updated: 10/15/2026, 18:48:21 UTC
Views: 28
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