CVE-2026-5676 | Totolink A8000R 5.9c.681_B20180413 /cgi-bin/cstecgi.cgi setLanguageCfg langType missing authentication

VDB-355503 · CVE-2026-5676 · GCVE-100-355503 TOTOLINK A8000R 5.9C.681_B20180413 /CGI-BIN/CSTECGI.CGI SETLANGUAGECFG LANGTYPE MISSING AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI Summaryinfo A vulnerability, which was classified as critical, has been found in Totolink A8000R 5.9c.681_B20180413. Impacted is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument langType results in missing authentication. This vulnerability was named CVE-2026-5676. The attack may be initiated remotely. In addition, an exploit is available. It is suggested to use restrictive firewalling. Detailsinfo A vulnerability, which was classified as critical, was found in Totolink A8000R 5.9c.681_B20180413. This affects the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument langType with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-5676. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The exploit is shared for download at github.com. It is declared as proof-of-concept. It is possible to mitigate the weakness by firewalling . Productinfo Vendor Totolink Name A8000R Version 5.9c.681_B20180413 License commercial Website Vendor: https://www.totolink.net/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 6.4 VulDB Base Score: 7.3 VulDB Temp Score: 6.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Missing authentication CWE: CWE-306 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Firewall Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/06/2026 Advisory disclosed 04/06/2026 +0 days VulDB entry created 04/06/2026 +0 days VulDB entry last update Sourcesinfo Vendor: totolink.net Advisory: github.com Status: Not defined CVE: CVE-2026-5676 (🔒) GCVE (CVE): GCVE-0-2026-5676 GCVE (VulDB): GCVE-100-355503 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 04/06/2026 11:43 Changes: 04/06/2026 11:43 (57) Complete: 🔍 Submitter: skeet Cache ID: 99:35E:101 Submitinfo Accepted Submit #792433: Totolink A8000R V5.9c.681_B20180413 Improper Authentication (by skeet) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸