CVE-2026-5676 Details
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.
An authentication bypass vulnerability has been identified in the Totolink A8000R router, specifically in the firmware version 5.9c.681_B20180413. The issue arises in the CGI script '/cgi-bin/cstecgi.cgi', within the 'setLanguageCfg' function. The vulnerability allows remote attackers to manipulate the 'langType' parameter, bypassing authentication and accessing restricted functions. This exploitation is possible without any login credentials, as the script fails to validate session cookies or authentication tokens before processing requests.
It is recommended to implement restrictive firewall rules to block unauthorized access to the vulnerable CGI script.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 6, 2026CISA-ADP
Assessed Apr 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/skeetabc/CVE-TOTOLINK-A800R/blob/main/vuln1_auth_bypass.md | [email protected] | ExploitTechnical Description |
| https://vuldb.com/submit/792433 | [email protected] | Technical Description |
| https://vuldb.com/vuln/355503 | [email protected] | AdvisoryBundleExploitRemedy |
| https://vuldb.com/vuln/355503/cti | [email protected] | Content Wall |
| https://www.totolink.net/ | [email protected] | Vendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Totolink A800R | 5.9c.681_B20180413 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Apr 6, 2026 | New CVE Received | [email protected] |