Auth bypass in Totolink A8000r
CVE-2026-5676
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.007 (51.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Totolink A8000r — versions 5.9c.681_B20180413
Weakness classification (CWE)
References
- vuldb.com/vuln/355503 (technical-description, vdb-entry)
- vuldb.com/vuln/355503/cti (signature, permissions-required)
- vuldb.com/submit/792433 (third-party-advisory)
- github.com/skeetabc/CVE-TOTOLINK-A800R/blob/main/vuln1_auth_bypass.md (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-5676?
- CVE-2026-5676 is a high-severity vulnerability in Totolink A8000r, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-04-06.
- How severe is CVE-2026-5676?
- High severity. CVSS v3 base score is 7.3 out of 10.