CVE-2026-13323

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Eclipse Open VSX", "vendor": "Eclipse Foundation", "versions": [{"lessThan": "1.0.2", "status": "affected", "version": "0.1.0", "versionType": "semver"}]}], "source": "emo@eclipse.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:open_vsx:*:*:*:*:*:*:*:*", "matchCriteriaId": "B5F7F9F8-48A6-4604-8CA4-65FCF39BA2FD", "versionEndExcluding": "1.0.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users."}, {"lang": "es", "value": "En Open VSX Registry antes de 1.0.2, el endpoint /vscode/unpkg/ sirve archivos HTML proporcionados por el usuario con Content-Type: text/html y sin una cabecera de respuesta Content-Security-Policy o Content-Disposition: attachment. Un atacante no autenticado puede registrar una cuenta de editor, cargar un VSIX que contenga una carga \u00fatil HTML manipulada e inducir a un usuario autenticado a visitar la URL resultante. El navegador renderiza el archivo en l\u00ednea en el contexto de origen open-vsx.org, lo que permite la exfiltraci\u00f3n de tokens de sesi\u00f3n, la generaci\u00f3n persistente de tokens de acceso personal (PAT) y la publicaci\u00f3n no autorizada de versiones de extensiones maliciosas. Debido a que las extensiones de Open VSX se distribuyen a VS Code, VSCodium, Cursor, Windsurf y editores compatibles, una actualizaci\u00f3n de extensi\u00f3n comprometida constituye un ataque a la cadena de suministro contra todos los usuarios finales."}], "id": "CVE-2026-13323", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 1.4, "source": "emo@eclipse.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "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:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 5.8, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-13323", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-01T12:13:20.675139Z", "version": "2.0.3"}}]}, "published": "2026-07-01T12:16:38.117", "references": [{"source": "emo@eclipse.org", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/eclipse-openvsx/openvsx/pull/1922"}, {"source": "emo@eclipse.org", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "emo@eclipse.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openvsx: Open VSX Registry: Supply chain attack via cross-site scripting", "id": "2495898", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2495898"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["A flaw was found in Open VSX Registry. The /vscode/unpkg/ endpoint serves user-supplied HTML files with a Content-Type of text/html without Content-Security-Policy or Content-Disposition: attachment response headers. An attacker with a registered publisher account can upload a VSIX containing a crafted HTML payload and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, allowing session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions"], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-13323", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/openvsx-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-07-01T11:28:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-13323\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-13323\nhttps://github.com/eclipse-openvsx/openvsx/pull/1922\nhttps://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485"], "statement": "This Moderate flaw in Open VSX Registry, as utilized by Red Hat OpenShift Dev Spaces, involves a cross-site scripting vulnerability. The `/vscode/unpkg/` endpoint serves user-supplied HTML without adequate security headers. An attacker with a registered publisher account could upload a crafted extension, and if an authenticated user is enticed to visit a specific URL, their session tokens could be exfiltrated, or unauthorized extension publications could occur. This requires both attacker prerequisites and user interaction, which limits the overall impact.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.0,1.0.2)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Eclipse Open VSX", "source": "cna", "vendor": "Eclipse Foundation"}, "product": "open_vsx", "vendor": "eclipse"}], "created": "2026-07-01T15:00:06.694518+00:00", "updated": "2026-08-01T23:45:03.656641+00:00", "vendors": ["eclipse", "eclipse$PRODUCT$open_vsx"]}