CVE-2026-31255

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:tenda:ac18_firmware:15.03.05.05:*:*:*:*:*:*:*", "matchCriteriaId": "4D5CB727-FC6B-4212-A61E-2888A0DADFB0", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:tenda:ac18:-:*:*:*:*:*:*:*", "matchCriteriaId": "CF9F8AF9-F921-4348-922B-EE5E6037E7AC", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Una vulnerabilidad de inyecci\u00f3n de comandos existe en Tenda AC18 V15.03.05.05_multi. La vulnerabilidad se encuentra en la interfaz /goform/SetSambaCfg, donde un manejo inadecuado del par\u00e1metro guestuser permite a los atacantes ejecutar comandos de sistema arbitrarios."}], "id": "CVE-2026-31255", "lastModified": "2026-11-11T19:10:00.360", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31255", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-28T15:05:55.581133Z", "version": "2.0.3"}}]}, "published": "2026-04-27T19:16:47.060", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.md"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.md"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-77"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-77"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "15.03.05.05_multi"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "ac18", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-04-29T02:18:22.191436+00:00", "value": {"mitigation_remediation": ["Update the router firmware to a version that fixes the command injection flaw.", "Restrict web administration access to trusted LAN subnets or the loopback interface, blocking external or unintended local access.", "Disable the Samba guest service if it is not required for network operations."], "summary": {"action": "Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The affected product is a Tenda AC18 router running firmware version V15.03.05.05_multi. No other vendors, products, or versions are listed in the CVE record.", "description_and_impact": "The vulnerability originates from improper handling of the guestuser parameter in the /goform/SetSambaCfg interface, allowing command injection. This weakness can be exploited to execute arbitrary system commands, giving an attacker full control over the device. It aligns with CWE-77, and jeopardizes confidentiality, integrity, and availability.", "risk_and_exploitability": "The CVSS score of 5.4 and an EPSS score of < 1% indicate a moderate vulnerability with a low but non-zero likelihood of exploitation. The likely attack vector is access to the router\u2019s web administration interface, reachable from the local network. Because the flaw permits arbitrary command execution, the potential risk is high, especially if an attacker can reach the interface from within the network or from a compromised device. The vulnerability is not listed in the CISA KEV catalog."}}}}, "created": "2026-04-28T09:17:31.827558+00:00", "title": "Command Injection in Tenda AC18 Firmware Allowing System Command Execution", "updated": "2026-04-29T02:30:07.566267+00:00", "vendors": ["tenda", "tenda$PRODUCT$ac18"]}