Vulnerability-Lookup

CNVD-2026-38847

Vulnerability from cnvd - Published: 2026-09-28

Title

Ubiquiti UniFi OS Server输入验证不当漏洞（CNVD-2026-38847）

Description

Ubiquiti UniFi OS Server是Ubiquiti推出的‌自托管版UniFi网络管理平台。 Ubiquiti UniFi OS Server存在输入验证不当漏洞，该漏洞源于对用户输入缺少充分的验证处理。攻击者可利用该漏洞执行任意命令。

Severity

高

Patch Name

Ubiquiti UniFi OS Server输入验证不当漏洞（CNVD-2026-38847）的补丁

Patch Description

Ubiquiti UniFi OS Server是Ubiquiti推出的‌自托管版UniFi网络管理平台。 Ubiquiti UniFi OS Server存在输入验证不当漏洞，该漏洞源于对用户输入缺少充分的验证处理。攻击者可利用该漏洞执行任意命令。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级程序修复该安全问题，详情见厂商官网: https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Reference

https://nvd.nist.gov/vuln/detail/cve-2026-77540

Impacted products

Name
Ubiquiti UniFi OS Server <5.1.37

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-77540",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-77540"
    }
  },
  "description": "Ubiquiti UniFi OS Server\u662fUbiquiti\u63a8\u51fa\u7684\u200c\u81ea\u6258\u7ba1\u7248UniFi\u7f51\u7edc\u7ba1\u7406\u5e73\u53f0\u3002\n\nUbiquiti UniFi OS Server\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u4e0d\u5f53\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5bf9\u7528\u6237\u8f93\u5165\u7f3a\u5c11\u5145\u5206\u7684\u9a8c\u8bc1\u5904\u7406\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6267\u884c\u4efb\u610f\u547d\u4ee4\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51:\r\nhttps://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-38847",
  "openTime": "2026-09-28",
  "patchDescription": "Ubiquiti UniFi OS Server\u662fUbiquiti\u63a8\u51fa\u7684\u200c\u81ea\u6258\u7ba1\u7248UniFi\u7f51\u7edc\u7ba1\u7406\u5e73\u53f0\u3002\r\n\r\nUbiquiti UniFi OS Server\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u4e0d\u5f53\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5bf9\u7528\u6237\u8f93\u5165\u7f3a\u5c11\u5145\u5206\u7684\u9a8c\u8bc1\u5904\u7406\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u6267\u884c\u4efb\u610f\u547d\u4ee4\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Ubiquiti UniFi OS Server\u8f93\u5165\u9a8c\u8bc1\u4e0d\u5f53\u6f0f\u6d1e\uff08CNVD-2026-38847\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Ubiquiti UniFi OS Server \u003c5.1.37"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/cve-2026-77540",
  "serverity": "\u9ad8",
  "submitTime": "2026-09-07",
  "title": "Ubiquiti UniFi OS Server\u8f93\u5165\u9a8c\u8bc1\u4e0d\u5f53\u6f0f\u6d1e\uff08CNVD-2026-38847\uff09"
}

CVE-2026-77540 (GCVE-0-2026-77540)

Vulnerability from cvelistv5 – Published: 2026-08-26 09:53 – Updated: 2026-08-27 03:56

Summary

A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 00:00 UTC

CWE

CWE-20 - Improper input validation

Assigner

Ubiquiti CNA under the mitre root

CNA scorecard D 58/100 over 29 records in the last 180 days details

References

1 reference

URL	Tags
https://community.ui.com/releases/Security-Adviso…

Impacted products

1 product

Vendor	Product	Version
Ubiquiti Inc	UniFi OS Server	Affected: 0 , < 5.1.37 (semver)

Show details on NVD website

JSON

To clipboard

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    "adp": [
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        "metrics": [
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                "id": "CVE-2026-77540",
                "options": [
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                    "Exploitation": "none"
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                  {
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-26T00:00:00+00:00",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "UniFi OS Server",
          "vendor": "Ubiquiti Inc",
          "versions": [
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              "lessThan": "5.1.37",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
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            }
          ],
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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      "source": {
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    "dateReserved": "2026-08-20T20:32:30.113Z",
    "dateUpdated": "2026-08-27T03:56:53.322Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CNVD-2026-38847

CVE-2026-77540 (GCVE-0-2026-77540)

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