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CVE-2026-5676— Totolink A8000R cstecgi.cgi setLanguageCfg missing authentication

Quick assessment

Affected
Totolink A8000R
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TOTOLINK A8000R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A8000R 5.9c.681_B20180413版本存在访问控制错误漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数langType的错误操作，可能导致缺少身份验证。

CVSS 7.3 · High EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5676

Vulnerability Information
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Vulnerability Title
Totolink A8000R cstecgi.cgi setLanguageCfg missing authentication
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Totolink A8000R 5.9c.681_B20180413. This issue affects the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. Such manipulation of the argument langType leads to missing authentication. The attack can be launched remotely. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK A8000R 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A8000R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A8000R 5.9c.681_B20180413版本存在访问控制错误漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数langType的错误操作，可能导致缺少身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Totolink A8000R 5.9c.681_B20180413 -

II. Public POCs for CVE-2026-5676

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7328 chars
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III. Intelligence Information for CVE-2026-5676

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Proof of Concept for CVE-2026-5676 (1)

Same Patch Batch · Totolink · 2026-04-06 · 9 CVEs total

CVE-2026-5677 7.3 HIGH Totolink A7100RU cstecgi.cgi CsteSystem os command injection
CVE-2026-5678 7.3 HIGH Totolink A7100RU cstecgi.cgi setScheduleCfg os command injection
CVE-2026-5688 7.3 HIGH Totolink A7100RU cstecgi.cgi setDdnsCfg os command injection
CVE-2026-5689 7.3 HIGH Totolink A7100RU cstecgi.cgi setNtpCfg os command injection
CVE-2026-5690 7.3 HIGH Totolink A7100RU cstecgi.cgi setRemoteCfg os command injection
CVE-2026-5691 7.3 HIGH Totolink A7100RU cstecgi.cgi setFirewallType os command injection
CVE-2026-5692 7.3 HIGH Totolink A7100RU cstecgi.cgi setGameSpeedCfg os command injection
CVE-2026-5679 5.5 MEDIUM Totolink A3300R cstecgi.cgi vsetTr069Cfg os command injection

IV. Related Vulnerabilities

Same vendor: Totolink
Same weakness: CWE-306

V. Comments for CVE-2026-5676

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