CVE-2026-1326Public exploitNetwork attack vector

Authenticated command execution via unsanitized Hostname

Published Jan 22, 2026 · Updated Jan 22, 2026

Command injection in TOTOLINK NR1800X Firmware 9.1.0u.6279_B20210910 allows remote authenticated users to execute shell commands. setWanCfg in /cgi-bin/cstecgi.cgi passes the POST body's hostName value to doSystem without neutralizing shell metacharacters. Access requires a valid session cookie; injected commands run with the web-management service's privileges and can read or alter router data or interrupt service.

CVSS severity6.3
Medium
EPSS probability3.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TOTOLINK NR1800X Firmware 9.1.0u.6279_B20210910 allows remote authenticated users to execute shell commands. setWanCfg in /cgi-bin/cstecgi.cgi passes the POST body's hostName value to doSystem without neutralizing shell metacharacters. Access requires a valid session cookie; injected commands run with the web-management service's privileges and can read or alter router data or interrupt service.

The record

CVE
CVE-2026-1326
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
TOTOLINK
Product
NR1800X Firmware
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.1.0u.6279_B20210910

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · NR1800X Firmwareversion=9.1.0u.6279_B20210910

Published CVSS scores

2.1VulDBCVSS: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
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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