{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-1009", "assignerOrgId": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "state": "PUBLISHED", "assignerShortName": "Altium", "dateReserved": "2026-01-15T22:08:45.185Z", "datePublished": "2026-01-15T22:51:32.441Z", "dateUpdated": "2026-01-16T17:17:45.223Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "modules": ["Forum post editing and rendering"], "platforms": ["Web"], "product": "Altium Forum (Altium 365)", "vendor": "Altium", "versions": [{"status": "affected", "version": "unspecified"}]}], "datePublic": "2026-01-15T22:48:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post.<br>Successful exploitation allows the attacker\u2019s payload to execute in the context of the victim\u2019s authenticated Altium 365 session, enabling unauthorized access to workspace data, including design files and workspace settings. Exploitation requires user interaction to view a malicious forum post.<br>"}], "value": "A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post.\nSuccessful exploitation allows the attacker\u2019s payload to execute in the context of the victim\u2019s authenticated Altium 365 session, enabling unauthorized access to workspace data, including design files and workspace settings. Exploitation requires user interaction to view a malicious forum post."}], "impacts": [{"capecId": "CAPEC-63", "descriptions": [{"lang": "en", "value": "CAPEC-63 Cross-Site Scripting"}]}, {"capecId": "CAPEC-122", "descriptions": [{"lang": "en", "value": "CAPEC-122 Privilege Abuse"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-284", "description": "CWE-284 Improper Access Control", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "shortName": "Altium", "dateUpdated": "2026-01-16T15:44:31.122Z"}, "references": [{"url": "https://www.altium.com/platform/security-compliance/security-advisories"}], "source": {"discovery": "UNKNOWN"}, "title": "Stored Cross-Site Scripting in Altium Enterprise Server Forum Leading to Cross-Customer Data Exposure", "x_generator": {"engine": "Vulnogram 0.5.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-16T17:17:26.393184Z", "id": "CVE-2026-1009", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-16T17:17:45.223Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "A stored cross-site scripting (XSS) vulnerability exists in the Altium Forum due to missing server-side input sanitization in forum post content. An authenticated attacker can inject arbitrary JavaScript into forum posts, which is stored and executed when other users view the affected post.\nSuccessful exploitation allows the attacker\u2019s payload to execute in the context of the victim\u2019s authenticated Altium 365 session, enabling unauthorized access to workspace data, including design files and workspace settings. Exploitation requires user interaction to view a malicious forum post."}], "id": "CVE-2026-1009", "lastModified": "2026-01-16T15:55:12.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 6.0, "source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "type": "Secondary"}]}, "published": "2026-01-15T23:15:51.153", "references": [{"source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "url": "https://www.altium.com/platform/security-compliance/security-advisories"}], "sourceIdentifier": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-284"}], "source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "type": "Secondary"}]}

{}