CVE-2026-51679Public exploitNetwork attack vector

Unauthenticated administrator takeover via missing CGI authentication

Published Aug 31, 2026 · Updated Aug 31, 2026

Incorrect access control in TOTOLINK T6 4.1.5cu.748_B20211015 allows remote attackers to change the administrator account. The setPasswordCfg handler in web_cste/cgi-bin/cstecgi.cgi accepts a POST request selecting setPasswordCfg and applies supplied credential parameters without authenticating the request. Network access to the web management endpoint is sufficient, and the attacker-supplied credentials replace control of the administrative account.

CVSS severity9.1
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect access control in TOTOLINK T6 4.1.5cu.748_B20211015 allows remote attackers to change the administrator account. The setPasswordCfg handler in web_cste/cgi-bin/cstecgi.cgi accepts a POST request selecting setPasswordCfg and applies supplied credential parameters without authenticating the request. Network access to the web management endpoint is sufficient, and the attacker-supplied credentials replace control of the administrative account.

The record

CVE
CVE-2026-51679
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.4TenableAV:N/AC:L/Au:N/C:C/I:N/A:C
9.1TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1098Account Manipulation

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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