Vulnerability-Lookup

GHSA-5MCW-4937-QQ36

Vulnerability from github – Published: 2026-03-16 15:30 – Updated: 2026-03-16 15:30

Details

ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses.

Severity ?

9.8 (Critical)


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

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2016-20030"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-551"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-16T14:17:49Z",
    "severity": "CRITICAL"
  },
  "details": "ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses.",
  "id": "GHSA-5mcw-4937-qq36",
  "modified": "2026-03-16T15:30:40Z",
  "published": "2026-03-16T15:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-20030"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/116485"
    },
    {
      "type": "WEB",
      "url": "https://packetstormsecurity.com/files/138573"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction"
    },
    {
      "type": "WEB",
      "url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5366.php"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2016-20030 (GCVE-0-2016-20030)

Vulnerability from cvelistv5 – Published: 2026-03-15 13:35 – Updated: 2026-03-16 14:20

Title

ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction

Summary

Severity ?

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

9.8 (Critical)


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

CWE

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Assigner

VulnCheck

References

URL

Tags

	https://www.zeroscience.mk/en/vulnerabilities/ZSL…	third-party-advisory
	https://exchange.xforce.ibmcloud.com/vulnerabilit…	vdb-entry
	https://packetstormsecurity.com/files/138573	exploit
	https://www.vulncheck.com/advisories/zkteco-zkbio…	third-party-advisory

Impacted products

	Vendor	Product	Version
	ZKTeco Inc.	ZKTeco ZKBioSecurity	Affected: 3.0.1.0_R_230

Date Public ?

2016-08-31 00:00

Credits

LiquidWorm as Gjoko Krstic of Zero Science Lab

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2016-20030",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-16T14:14:00.622167Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-16T14:20:20.095Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
    ],
    "cna": {
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          "product": "ZKTeco ZKBioSecurity",
          "vendor": "ZKTeco Inc.",
          "versions": [
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              "version": "3.0.1.0_R_230"
            }
          ]
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      ],
      "credits": [
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          "type": "finder",
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        }
      ],
      "datePublic": "2016-08-31T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do script with varying username inputs to enumerate valid user accounts based on application responses."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
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            "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"
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      "problemTypes": [
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          "descriptions": [
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-03-15T13:35:32.348Z",
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        },
        {
          "name": "IBM X-Force Exchange",
          "tags": [
            "vdb-entry"
          ],
          "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/116485"
        },
        {
          "name": "Packet Storm Security",
          "tags": [
            "exploit"
          ],
          "url": "https://packetstormsecurity.com/files/138573"
        },
        {
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          "tags": [
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          ],
          "url": "https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-user-enumeration-via-authloginaction"
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      ],
      "title": "ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction",
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  },
  "cveMetadata": {
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    "datePublished": "2026-03-15T13:35:32.348Z",
    "dateReserved": "2026-03-15T12:37:09.340Z",
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}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5MCW-4937-QQ36

CVE-2016-20030 (GCVE-0-2016-20030)

Tags

Sightings

Nomenclature