What is CVE-2026-31255?

CVE-2026-31255 is a critical-severity vulnerability in Tenda Ac18, classified under Command Injection. CVSS score: 9.8/10. Published 2026-04-27.

How severe is CVE-2026-31255?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Tenda Ac18

CVE-2026-31255

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system c…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.002 (47.5th percentile) — read the EPSS interpretation.

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

Tenda Ac18
Tenda Ac18_firmware — versions 15.03.05.05
N/a — versions n/a

Weakness classification (CWE)

CWE-77 — Command Injection

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-31255?: CVE-2026-31255 is a critical-severity vulnerability in Tenda Ac18, classified under Command Injection. CVSS score: 9.8/10. Published 2026-04-27.
How severe is CVE-2026-31255?: Critical severity. CVSS v3 base score is 9.8 out of 10.