CVE-2026-9053 (GCVE-0-2026-9053)

Vulnerability from cvelistv5 – Published: 2026-05-22 02:57 – Updated: 2026-05-22 12:36
VLAI?
Summary
Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element.
Severity ?
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/AU:N/R:A/RE:L/U:Amber
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
9front 9front Affected: f04e113279274526a8dae34de373027b68921fbf , < d145acc9ef0da47131af6ad94e87264e04870d47 (git)
Create a notification for this product.
Credits
Kristo Kristo Jacob Moody Kristo cinap_lenrek
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9053",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T12:35:42.430223Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-434",
                "description": "CWE-434 Unrestricted Upload of File with Dangerous Type",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-22T12:36:11.446Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "mothra"
          ],
          "packageName": "mothra",
          "platforms": [
            "x86",
            "32 bit",
            "64 bit"
          ],
          "product": "9front",
          "programFiles": [
            "/sys/src/cmd/mothra/forms.c"
          ],
          "programRoutines": [
            {
              "name": "rdform()"
            }
          ],
          "repo": "https://git.9front.org/plan9front/9front/HEAD/info.html",
          "vendor": "9front",
          "versions": [
            {
              "lessThan": "d145acc9ef0da47131af6ad94e87264e04870d47",
              "status": "affected",
              "version": "f04e113279274526a8dae34de373027b68921fbf",
              "versionType": "git"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kristo"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Kristo"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Jacob Moody"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Kristo"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "cinap_lenrek"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element."
            }
          ],
          "value": "Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NO",
            "Recovery": "AUTOMATIC",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/AU:N/R:A/RE:L/U:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "LOW"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T02:57:35.162Z",
        "orgId": "1d66c9f9-fff2-411a-aa19-ca6312fa25e9",
        "shortName": "9front"
      },
      "references": [
        {
          "tags": [
            "mitigation"
          ],
          "url": "https://git.9front.org/plan9front/9front/d145acc9ef0da47131af6ad94e87264e04870d47/commit.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-10T18:00:00.000Z",
          "value": "Initial private disclosure"
        },
        {
          "lang": "en",
          "time": "2026-05-11T18:18:00.000Z",
          "value": "Fix committed"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1d66c9f9-fff2-411a-aa19-ca6312fa25e9",
    "assignerShortName": "9front",
    "cveId": "CVE-2026-9053",
    "datePublished": "2026-05-22T02:57:35.162Z",
    "dateReserved": "2026-05-19T21:39:13.119Z",
    "dateUpdated": "2026-05-22T12:36:11.446Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9053",
      "date": "2026-05-23",
      "epss": "0.00042",
      "percentile": "0.13014"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-9053\",\"sourceIdentifier\":\"1d66c9f9-fff2-411a-aa19-ca6312fa25e9\",\"published\":\"2026-05-22T04:16:28.430\",\"lastModified\":\"2026-05-22T04:16:28.430\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"1d66c9f9-fff2-411a-aa19-ca6312fa25e9\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/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:N/R:A/V:X/RE:L/U:Amber\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"ACTIVE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"HIGH\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"PROOF_OF_CONCEPT\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NO\",\"Recovery\":\"AUTOMATIC\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"LOW\",\"providerUrgency\":\"AMBER\"}}]},\"references\":[{\"url\":\"https://git.9front.org/plan9front/9front/d145acc9ef0da47131af6ad94e87264e04870d47/commit.html\",\"source\":\"1d66c9f9-fff2-411a-aa19-ca6312fa25e9\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-9053\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-22T12:35:42.430223Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-434\", \"description\": \"CWE-434 Unrestricted Upload of File with Dangerous Type\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T12:25:29.106Z\"}}], \"cna\": {\"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Kristo\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Kristo\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Jacob Moody\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Kristo\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"cinap_lenrek\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"AUTOMATIC\", \"baseScore\": 6.9, \"Automatable\": \"NO\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/AU:N/R:A/RE:L/U:Amber\", \"exploitMaturity\": \"PROOF_OF_CONCEPT\", \"providerUrgency\": \"AMBER\", \"userInteraction\": \"ACTIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"LOW\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://git.9front.org/plan9front/9front/HEAD/info.html\", \"vendor\": \"9front\", \"modules\": [\"mothra\"], \"product\": \"9front\", \"versions\": [{\"status\": \"affected\", \"version\": \"f04e113279274526a8dae34de373027b68921fbf\", \"lessThan\": \"d145acc9ef0da47131af6ad94e87264e04870d47\", \"versionType\": \"git\"}], \"platforms\": [\"x86\", \"32 bit\", \"64 bit\"], \"packageName\": \"mothra\", \"programFiles\": [\"/sys/src/cmd/mothra/forms.c\"], \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"rdform()\"}]}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-10T18:00:00.000Z\", \"value\": \"Initial private disclosure\"}, {\"lang\": \"en\", \"time\": \"2026-05-11T18:18:00.000Z\", \"value\": \"Fix committed\"}], \"references\": [{\"url\": \"https://git.9front.org/plan9front/9front/d145acc9ef0da47131af6ad94e87264e04870d47/commit.html\", \"tags\": [\"mitigation\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.2\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element.\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"1d66c9f9-fff2-411a-aa19-ca6312fa25e9\", \"shortName\": \"9front\", \"dateUpdated\": \"2026-05-22T02:57:35.162Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9053\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-22T12:36:11.446Z\", \"dateReserved\": \"2026-05-19T21:39:13.119Z\", \"assignerOrgId\": \"1d66c9f9-fff2-411a-aa19-ca6312fa25e9\", \"datePublished\": \"2026-05-22T02:57:35.162Z\", \"assignerShortName\": \"9front\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Detection rules are retrieved from Rulezet.