CVE-2026-8727 (GCVE-0-2026-8727)

Vulnerability from cvelistv5 – Published: 2026-05-19 09:16 – Updated: 2026-05-19 13:25
VLAI
Title
Remote Code Execution in extension "Site Crawler" (crawler)
Summary
The Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP's unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
TYPO3 Extension "Site Crawler" Affected: 12.0.0 , < 12.0.11 (semver)
Affected: 0 , < 11.0.13 (semver)
Create a notification for this product.
Date Public
2026-05-19 09:00
Credits
Roman Hergenreder Tomas Norre Mikkelsen
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-8727",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-19T13:25:27.312318Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-19T13:25:34.994Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://packagist.org/",
          "defaultStatus": "unaffected",
          "packageName": "tomasnorre/crawler",
          "product": "Extension \"Site Crawler\"",
          "repo": "https://github.com/tomasnorre/crawler",
          "vendor": "TYPO3",
          "versions": [
            {
              "lessThan": "12.0.11",
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "11.0.13",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Roman Hergenreder"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Tomas Norre Mikkelsen"
        }
      ],
      "datePublic": "2026-05-19T09:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The Crawler extension passes the \u003ccode\u003eX-T3Crawler-Meta\u003c/code\u003e response header from crawled URLs directly to PHP\u0027s \u003ccode\u003eunserialize()\u003c/code\u003e. An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task."
            }
          ],
          "value": "The Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP\u0027s unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-19T09:16:33.677Z",
        "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "shortName": "TYPO3"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-008"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Remote Code Execution in extension \"Site Crawler\" (crawler)",
      "x_generator": {
        "engine": "Vulnogram 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
    "assignerShortName": "TYPO3",
    "cveId": "CVE-2026-8727",
    "datePublished": "2026-05-19T09:16:33.677Z",
    "dateReserved": "2026-05-16T09:55:33.916Z",
    "dateUpdated": "2026-05-19T13:25:34.994Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-8727",
      "date": "2026-06-22",
      "epss": "0.00389",
      "percentile": "0.30549"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-8727\",\"sourceIdentifier\":\"f4fb688c-4412-4426-b4b8-421ecf27b14a\",\"published\":\"2026-05-19T10:16:25.747\",\"lastModified\":\"2026-05-19T14:47:13.200\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP\u0027s unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"f4fb688c-4412-4426-b4b8-421ecf27b14a\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"ACTIVE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"LOW\",\"subAvailabilityImpact\":\"LOW\",\"exploitMaturity\":\"NOT_DEFINED\",\"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\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"f4fb688c-4412-4426-b4b8-421ecf27b14a\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"references\":[{\"url\":\"https://typo3.org/security/advisory/typo3-ext-sa-2026-008\",\"source\":\"f4fb688c-4412-4426-b4b8-421ecf27b14a\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-8727\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-19T13:25:27.312318Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-19T13:25:31.426Z\"}}], \"cna\": {\"title\": \"Remote Code Execution in extension \\\"Site Crawler\\\" (crawler)\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Roman Hergenreder\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Tomas Norre Mikkelsen\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 7.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"ACTIVE\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"HIGH\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/tomasnorre/crawler\", \"vendor\": \"TYPO3\", \"product\": \"Extension \\\"Site Crawler\\\"\", \"versions\": [{\"status\": \"affected\", \"version\": \"12.0.0\", \"lessThan\": \"12.0.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"11.0.13\", \"versionType\": \"semver\"}], \"packageName\": \"tomasnorre/crawler\", \"collectionURL\": \"https://packagist.org/\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-05-19T09:00:00.000Z\", \"references\": [{\"url\": \"https://typo3.org/security/advisory/typo3-ext-sa-2026-008\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"The Crawler extension passes the X-T3Crawler-Meta response header from crawled URLs directly to PHP\u0027s unserialize(). An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The Crawler extension passes the \u003ccode\u003eX-T3Crawler-Meta\u003c/code\u003e response header from crawled URLs directly to PHP\u0027s \u003ccode\u003eunserialize()\u003c/code\u003e. An attacker controlling a crawled endpoint can inject arbitrary serialized PHP objects, leading to Remote Code Execution on the TYPO3 server. Exploitation requires administrative privileges to configure a crawler-enabled page and trigger the crawl via a Scheduler task.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-502\", \"description\": \"CWE-502 Deserialization of Untrusted Data\"}]}], \"providerMetadata\": {\"orgId\": \"f4fb688c-4412-4426-b4b8-421ecf27b14a\", \"shortName\": \"TYPO3\", \"dateUpdated\": \"2026-05-19T09:16:33.677Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-8727\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-19T13:25:34.994Z\", \"dateReserved\": \"2026-05-16T09:55:33.916Z\", \"assignerOrgId\": \"f4fb688c-4412-4426-b4b8-421ecf27b14a\", \"datePublished\": \"2026-05-19T09:16:33.677Z\", \"assignerShortName\": \"TYPO3\"}",
      "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.