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Vulnerabilities

Vulnerability · CVE-2026-31255

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi.

Published Apr 27, 2026 · catalog updated Jun 17, 2026 · ac18 firmware

Check if you run it

No confirmed exploitation is on record for CVE-2026-31255. EPSS is 1.49%. Act only if a listed version of ac18 firmware is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.49%
Remediation
Not established
Affected products
cpe tenda/ac18 firmware

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe tenda/ac18 firmware15.03.05.05

How to fix CVE-2026-31255

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-31255. EPSS is 1.49%. Act only if a listed version of ac18 firmware is installed.

Which versions are affected?

Compare what you have installed with tenda/ac18 firmware 15.03.05.05. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-77: Command Injection. EPSS 1.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 27, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-31255

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31255

    30-day exploitation probability 1.5%

    first.org
  • NIST NVDVulnerability recordCVE-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 commands.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.