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TOTOLINK T6 EUVDEUVD-2026-67920

| CVE-2026-51646 CRITICAL
Improper Access Control (CWE-284)
2026-08-28 mitre GHSA-49jh-9cvx-g4v9
9.1
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
5.3 MEDIUM

Remote unauthenticated read of parental-control rules gives limited confidentiality impact (C:L); no integrity or availability effect, so I:N/A:N - the input I:H is unsupported.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

5
Metadata Corrected
Sep 01, 2026 - 17:40 vuln.today
tag: N A removed
Analysis Generated
Sep 01, 2026 - 17:29 vuln.today
CVSS changed
Sep 01, 2026 - 17:22 NVD
9.1 (CRITICAL)
CVE Published
Aug 28, 2026 - 00:00 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 00:00 cve.org
CRITICAL 9.1

DescriptionCVE.org

Incorrect access control in the getParentalRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain parental-control rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated information disclosure in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers read the device's parental-control rules by sending a crafted POST request to the getParentalRules handler on /cgi-bin/cstecgi.cgi. The endpoint lacks any access-control check, so no credentials are required. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation Exploitation requires network reachability to the router's HTTP management service and the ability to POST to /cgi-bin/cstecgi.cgi invoking the getParentalRules function on firmware 4.1.5cu.748_B20211015 - no authentication, credentials, or user interaction are needed (AV:N/AC:L/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The input CVSS 9.1 vector (AV:N/AC:L/PR:N/UI:N/C:H/I:H) overstates real impact: the described behavior is a read-only disclosure of parental-control rules via getParentalRules, so the I:H (high integrity) component is unsupported and confidentiality impact is modest (policy metadata, not credentials or full configuration). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patched firmware version is identified in the provided data at time of analysis; the TOTOLINK references point to the general product/download pages rather than a specific fixed build, so check https://www.totolink.net/ for firmware newer than 4.1.5cu.748_B20211015 and apply it once available. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify and inventory all TOTOLINK T6 routers on the network, particularly those in management or security-sensitive segments. …

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EUVD-2026-67920 vulnerability details – vuln.today

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