EUVD-2026-67886
GHSA-6jxw-8xf7-29wq
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Adjacent-network reach (AV:A) with no auth required (PR:N); only guest Wi-Fi config disclosed (C:L), no write or disruption capability (I:N/A:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the getWiFiGuestCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain guest Wi-Fi configuration information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Guest Wi-Fi configuration exposure in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows any adjacent-network attacker without credentials to retrieve the router's guest wireless settings by sending a crafted POST to /cgi-bin/cstecgi.cgi invoking the getWiFiGuestCfg function. The CGI dispatcher performs no session or privilege check before returning guest SSID and passphrase data, a pattern consistent with multiple other access-control deficiencies in the same firmware. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be on the same adjacent network segment (LAN or Wi-Fi) as the TOTOLINK T6 router running firmware 4.1.5cu.748_B20211015 - remote internet-based exploitation is not possible given AV:A in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, score 4.3) is well-calibrated: exploitation is constrained to the adjacent network, the confidentiality impact is limited to guest Wi-Fi credentials rather than core admin secrets, and there is no integrity or availability impact. … 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 patch with a specific fixed firmware version has been identified at the time of analysis; references point only to TOTOLINK's general firmware download page and GitHub researcher coordination repositories, neither of which specifies a remediated build. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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