CVE-2026-1548
Published: 28 January 2026
Summary
CVE-2026-1548 is a medium-severity Injection (CWE-74) vulnerability in Totolink A7000R Firmware. Its CVSS base score is 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 15.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-1548 is a command injection vulnerability in the Totolink A7000R router running firmware version 4.1cu.4154. The flaw affects the CloudACMunualUpdateUserdata function within the /cgi-bin/cstecgi.cgi script, where manipulation of the 'url' argument enables arbitrary command execution. Associated with CWE-74 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-77 (Command Injection), it carries a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).
The vulnerability can be exploited remotely by an attacker with low privileges, such as an authenticated user, requiring no user interaction. Successful exploitation allows command injection, potentially granting limited access to confidential data, minor integrity disruptions, and low-level availability impacts on the affected device.
Advisories referenced in VulDB entries (ctiid.343232, id.343232) and related submissions document the issue, while GitHub repositories provide detailed proof-of-concept exploits for the RCE via CloudACMunualUpdateUserdata. No specific patches or mitigation steps are detailed in the available references.
Published on January 28, 2026, the exploit has been publicly released and may be actively used against vulnerable Totolink A7000R devices.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-4976
Vulnerability details
A flaw has been found in Totolink A7000R 4.1cu.4154. This impacts the function CloudACMunualUpdateUserdata of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument url causes command injection. The attack can be initiated remotely. The exploit has been published and may…
more
be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE enables remote exploitation of a public-facing web application (T1190) leading to command injection on a network device CLI (T1059.008).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the 'url' argument in the CloudACMunualUpdateUserdata CGI function to block command injection attacks.
Mandates identification, prioritization, and remediation of the specific command injection flaw in Totolink A7000R firmware 4.1cu.4154.
Requires vulnerability scanning to identify and remediate instances of CVE-2026-1548 in deployed router systems.