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

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k1.88

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 .

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔒

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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: 216:0C4:103

Submitinfo

Accepted

  • Submit #792433: Totolink A8000R V5.9c.681_B20180413 Improper Authentication (by skeet)

Be aware that VulDB is the high quality source for vulnerability data.

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