Description
Incorrect access control in the getOnlineClient function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain online client information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Published: 2026-08-28
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Information disclosure of online client data via unauthenticated access
Action: Apply patch
AI Analysis

Impact

TOTOLINK T6 firmware version 4.1.5cu.748_B20211015 contains an improper access control flaw in the getOnlineClient function. The flaw allows an attacker to send a crafted POST request to /cgi-bin/cstecgi.cgi and receive online client information without authentication. This represents a vulnerability for which the exploited weakness is classified as CWE-284: Improper Access Control, providing unauthorized disclosure of data to external parties.

Affected Systems

The affected product is the TOTOLINK T6 router running firmware version 4.1.5cu.748_B20211015.

Risk and Exploitability

The vulnerability permits unauthenticated attackers to obtain potentially sensitive client information over the network. The EPSS score is less than 1%, indicating a low probability of exploitation. Based on the available information, no public exploit or exploit code has been reported. The CVSS score of 7.5 indicates a medium to high severity, confirming a significant confidentiality risk. There is no indication that this vulnerability is listed in the CISA KEV catalog.

Generated by OpenCVE AI on September 2, 2026 at 06:38 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Obtain and install the official firmware update released by TOTOLINK that addresses the not-authorized access to /cgi-bin/cstecgi.cgi
  • Configure the router or surrounding network devices to block HTTP POST traffic to /cgi-bin/cstecgi.cgi from unauthenticated or unknown sources, ensuring only authenticated requests reach the endpoint
  • Apply access controls on the router’s web interface so that the getOnlineClient function is only accessible after successful authentication, if the firmware does not already implement this check

Generated by OpenCVE AI on September 2, 2026 at 06:38 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 02 Sep 2026 07:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated Access to Online Client Information in TOTOLINK T6

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 28 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Totolink
Totolink t6
Vendors & Products Totolink
Totolink t6

Fri, 28 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated Access to Online Client Information in TOTOLINK T6
Weaknesses CWE-284

Fri, 28 Aug 2026 19:45:00 +0000

Type Values Removed Values Added
Description Incorrect access control in the getOnlineClient function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain online client information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
References

Subscriptions

Totolink T6
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-01T16:14:32.588Z

Reserved: 2026-06-08T00:00:00.000Z

Link: CVE-2026-51619

cve-icon Vulnrichment

Updated: 2026-09-01T15:43:06.781Z

cve-icon NVD

Status : Deferred

Published: 2026-08-28T20:18:05.077

Modified: 2026-09-01T17:17:26.500

Link: CVE-2026-51619

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T06:45:05Z

Weaknesses