Command Injection Vulnerability in Totolink WA300 by Totolink
CVE-2026-7720

5.3MEDIUM

Key Information:

Vendor

Totolink
Status
Wa300
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7720?

A vulnerability has been discovered in the Totolink WA300 router's POST Request Handler, specifically within the setLanguageCfg function in the /cgi-bin/cstecgi.cgi script. This weakness allows an attacker to manipulate the langType argument, potentially leading to command injection. The exploit is publicly accessible, meaning unauthorized users can remotely execute commands on the affected device, posing significant security risks.

Affected Version(s)

WA300 5.2cu.7112_B20190227

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-7720 - Proof of Concept

References

https://vuldb.com/vuln/360896
vdb-entrytechnical-description
https://vuldb.com/vuln/360896/cti
signaturepermissions-required
https://vuldb.com/submit/807198
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wxhwxhwxh_mie (VulDB User)
.