{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91921", "assignerOrgId": "0cbda920-cd7f-484a-8e76-bf7f4b7f4516", "state": "PUBLISHED", "assignerShortName": "INCIBE", "dateReserved": "2026-09-15T10:40:40.901Z", "datePublished": "2026-09-21T09:43:37.622Z", "dateUpdated": "2026-09-21T10:02:51.313Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "0cbda920-cd7f-484a-8e76-bf7f4b7f4516", "shortName": "INCIBE", "dateUpdated": "2026-09-21T10:02:51.313Z"}, "title": "Cross-Site Scripting (XSS) in 1millionbot\u2019s AI chatbot platform", "datePublic": "2026-09-21T09:29:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-63", "descriptions": [{"lang": "en", "value": "CAPEC-63 Cross-Site Scripting (XSS)"}]}], "affected": [{"vendor": "1millionbot", "product": "AI Chatbot Platform (SaaS) de 1millionbot.", "versions": [{"status": "affected", "version": "Version prior to CVE publication"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:1millionbot:ai_chatbot_platform_saas_de_1millionbot.:version_prior_to_cve_publication:*:*:*:*:*:*:*"}]}]}], "descriptions": [{"lang": "en", "value": "Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user\u2019s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user\u2019s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified."}]}], "references": [{"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-xss-1millionbots-ai-chatbot-platform", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"}}], "solutions": [{"lang": "en", "value": "The vulnerability has been fixed by the 1millionbot team.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "The vulnerability has been fixed by the 1millionbot team."}]}], "credits": [{"lang": "en", "value": "Alejandro Gonz\u00e1lez Mart\u00ednez", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "AI Chatbot Platform (SaaS) de 1millionbot.", "vendor": "1millionbot", "versions": [{"status": "affected", "version": "Version prior to CVE publication"}]}], "source": "cve-coordination@incibe.es"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user\u2019s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified."}], "id": "CVE-2026-91921", "lastModified": "2026-09-21T10:17:15.873", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cve-coordination@incibe.es", "type": "Secondary"}]}, "published": "2026-09-21T10:17:15.873", "references": [{"source": "cve-coordination@incibe.es", "url": "https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-xss-1millionbots-ai-chatbot-platform"}], "sourceIdentifier": "cve-coordination@incibe.es", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "cve-coordination@incibe.es", "type": "Primary"}]}

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