Summary
generated automatically from NVD dataCVE-2026-31255 is a command injection flaw (CWE-77) in the Tenda AC18 router firmware, version 15.03.05.05_multi. The /goform/SetSambaCfg interface handles the guestuser parameter improperly, which lets an attacker run arbitrary system commands on the device. The network-reachable flaw needs no privileges or user interaction, and it has a CVSS v3.1 score of 9.8 (CRITICAL).
NVD description
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 commands.
EPSS · FIRST.org
1.5%probability of exploitation in the next 30 days
Higher than 73% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-19, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 27 avr. 2026
- Updated
- 17 juin 2026
- Status
- Modified
- Source
- cve@mitre.org
Affected products
Weaknesses (CWE)
References (2)
- https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.mdExploitThird Party Advisory
- https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.mdExploitThird Party Advisory
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