CVE-2025-15104

{"id": "CVE-2025-15104", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-15104", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-16T14:30:52.612901Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "help@fluidattacks.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "help@fluidattacks.com", "affectedData": [{"repo": "https://github.com/validator/validator", "vendor": "The Nu Html Checker", "product": "The Nu Html Checker", "versions": [{"status": "affected", "version": "latest - commit:23f090a11bab8d0d4e698f1ffc197a4fe226a9cd"}], "platforms": ["Windows", "Linux", "MacOS"], "defaultStatus": "unknown"}]}], "published": "2026-01-16T14:15:54.317", "references": [{"url": "https://fluidattacks.com/advisories/europe", "tags": ["Exploit", "Third Party Advisory"], "source": "help@fluidattacks.com"}, {"url": "https://github.com/validator/validator", "tags": ["Product"], "source": "help@fluidattacks.com"}, {"url": "https://fluidattacks.com/advisories/europe", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "help@fluidattacks.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd)."}, {"lang": "es", "value": "Nu Html Checker (validator.nu) contiene un bypass de restricci\u00f3n que permite a atacantes remotos hacer que el servidor realice solicitudes HTTP/HTTPS arbitrarias a recursos internos, incluyendo servicios de localhost. Si bien el validador implementa protecciones basadas en nombre de host para bloquear el acceso directo a localhost y 127.0.0.1, estos controles pueden ser eludidos utilizando t\u00e9cnicas de reasociaci\u00f3n de DNS o dominios que se resuelven a direcciones de bucle invertido. Este problema afecta a The Nu Html Checker (vnu): la \u00faltima versi\u00f3n (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd)."}], "lastModified": "2026-06-17T08:37:07.217", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:validator:validator:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6A5FD28B-2330-4CF3-9170-0189849D2AB7", "versionEndExcluding": "2026-01-11"}], "operator": "OR"}]}], "sourceIdentifier": "help@fluidattacks.com"}