What is CVE-2026-7720?

CVE-2026-7720 is a medium-severity vulnerability in Totolink Wa300, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-05-04.

How severe is CVE-2026-7720?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in Totolink Wa300

CVE-2026-7720

A weakness has been identified in Totolink WA300 5.2cu.7112_B20190227. The impacted element is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. This manipulation of the argument langType causes command injection. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks.

Published 2026-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.018 (77.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.018 · change: +0.009

Affected products

Totolink Wa300 — versions 5.2cu.7112_B20190227

Weakness classification (CWE)

References

vuldb.com/vuln/360896 (technical-description, vdb-entry)
vuldb.com/vuln/360896/cti (signature, permissions-required)
vuldb.com/submit/807198 (third-party-advisory)
lavender-bicycle-a5a.notion.site/TOTOLINK-WA300-setLanguageCfg-34553a41781f8007… (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-7720?: CVE-2026-7720 is a medium-severity vulnerability in Totolink Wa300, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-05-04.
How severe is CVE-2026-7720?: Medium severity. CVSS v3 base score is 6.3 out of 10.