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: n/a
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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. While no exploit code or public exploits are reported and the EPSS score is not available, the lack of authentication creates a substantial confidentiality risk. The CVSS score is not listed, so the exact severity is unknown, but the exposure is sufficient to warrant action. There is no indication that the vulnerability is listed in CISA KEV catalog.

Generated by OpenCVE AI on August 28, 2026 at 20:39 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 August 28, 2026 at 20:39 UTC.

Tracking

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Advisories

No advisories yet.

History

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: 2026-08-28T15:47:46.682Z

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

Link: CVE-2026-51619

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

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

Modified: 2026-08-28T21:20:39.190

Link: CVE-2026-51619

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T21:00:04Z

Weaknesses