RCE in Zbtlink We1326
CVE-2026-74233
Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.
Vulnerability class: Command Injection (OS Command Injection)
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Zbtlink We1326 — versions 19.1101
- Zbtlink We2426-c — versions 19.1112
- Zbtlink We357 — versions 19.1101
- Zbtlink We5926 — versions 19.1101
- Zbtlink We5926-ec_qp — versions 20.0516
- Zbtlink We5926-wd — versions 19.1101
- Zbtlink We826-q — versions 19.1101
- Zbtlink We826-t2 — versions 19.1101
- Zbtlink We826-wd — versions 19.1101
- Zbtlink Wf3526-p — versions 19.051
Weakness classification (CWE)
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74233?
- CVE-2026-74233 is a critical-severity vulnerability in Zbtlink We1326, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-08-27.
- How severe is CVE-2026-74233?
- Critical severity. CVSS v3 base score is 9.8 out of 10.