What is the CVSS score of EUVD-2026-67891?

EUVD-2026-67891 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.2%.

TOTOLINK T6 EUVD-2026-67891

| CVE-2026-51633 MEDIUM

Improper Access Control (CWE-284)

2026-08-28 mitre

GHSA-cgmh-jfxg-mwch

Authentication Bypass

4.3

CVSS 3.1 · Vendor: mitre

Severity by source

Vendor (mitre) PRIMARY

4.3 MEDIUM

AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

vuln.today AI

4.3 MEDIUM

Adjacent-only vector confirmed; no auth required; C:L appropriate as only guest credentials are exposed, not admin or WAN data.

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

4.0 AV:A/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

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Metadata Corrected

Sep 01, 2026 - 20:40 vuln.today

tag: N A removed

Analysis Generated

Sep 01, 2026 - 19:40 vuln.today

CVSS changed

Sep 01, 2026 - 19:22 NVD

4.3 (MEDIUM)

CVE Published

Aug 28, 2026 - 00:00 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect access control in the getWiFiEasyGuestCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain simplified guest Wi-Fi configuration, including guest credentials, via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

AnalysisAI

Unauthenticated guest Wi-Fi credential exposure in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows adjacent-network attackers to retrieve the guest network SSID and password by posting a crafted request to /cgi-bin/cstecgi.cgi targeting the getWiFiEasyGuestCfg handler, which performs no session or authentication validation before returning configuration data. The vulnerability is part of a broader pattern of access-control omissions across this firmware's CGI dispatcher. …

Unlock full vulnerability intelligence

Risk assessment & exploitation conditions
Attack chain visualization
Remediation with exact patch versions
Threat intelligence from 22 sources
Personal watchlist & email alerts

Continue with Google Continue with GitHub

Free forever · No credit card required

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

Access

technique details hidden

Exploit

technique details hidden

Execution

technique details hidden

Impact

technique details hidden

Vulnerability AssessmentAI

Exploitation	The attacker must have adjacent network access - either within Wi-Fi radio range or already present on the same LAN segment as the router. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 4.3 score with AV:A is an accurate representation of realistic risk. … 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	Check the TOTOLINK firmware download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a firmware release that enforces authentication on the getWiFiEasyGuestCfg CGI handler. … Detailed patch versions, workarounds, and compensating controls in full report.