Cyber Resilience

CVE-2026-9531

Low

Published: 26 May 2026

Published
26 May 2026
Modified
28 May 2026
KEV Added
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Patch
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CVSS Score v4 2.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0484 89.8th percentile
Risk Priority 7 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-9531 is a low-severity Command Injection (CWE-77) vulnerability in Totolink CA750-PoE (inferred from references). Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 10.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

A weakness has been identified in Totolink CA750-PoE 6.2c.510. Impacted is the function setUpgradeUboot of the file /cgi-bin/cstecgi.cgi of the component Setting Handler. This manipulation of the argument FileName causes os command injection. The attack is possible to be carried…

more

out remotely. The exploit has been made available to the public and could be used for attacks.

CWE(s)
CWE-77CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Remote OS command injection in a public-facing CGI endpoint directly enables T1190 exploitation and Unix shell command execution via T1059.004.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

Affected Assets

Totolink
CA750-PoE
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References