SEPTEMBER 15, 2026
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Case File

CVE-2026-51689

CRITICAL · CVSS 9.1 EPSS 0.43% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-31 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

The TOTOLINK T6 firmware version 4.1.5cu.748_B20211015 is vulnerable due to improper access controls in the setUpgradeFW function, allowing unauthenticated attackers to manipulate the firmware upgrade process through specially crafted POST requests. This vulnerability could lead to unauthorized firmware changes, potentially compromising device integrity and security. Organizations using affected TOTOLINK devices should prioritize addressing this issue to mitigate risks associated with unauthorized access and potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-51689
Severity
CRITICAL
CVSS
9.1
EPSS
0.43%

Original NVD 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.