CVE-2026-4983

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4983", "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "state": "PUBLISHED", "assignerShortName": "eclipse", "dateReserved": "2026-03-27T12:31:27.749Z", "datePublished": "2026-06-23T10:50:38.938Z", "dateUpdated": "2026-06-23T12:03:13.663Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse", "dateUpdated": "2026-06-23T10:50:38.938Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')", "type": "CWE"}]}], "affected": [{"vendor": "Eclipse Foundation", "product": "Eclipse Open VSX", "repo": "https://github.com/eclipse-openvsx/openvsx", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "0.34.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with Content-Type: image/svg+xml without security headers such as Content-Security-Policy or Content-Disposition: attachment. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL.\n\n\n\n\nOn deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with <code>Content-Type: image/svg+xml</code> without security headers such as <code>Content-Security-Policy</code> or <code>Content-Disposition: attachment</code>. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL.</p>\n<p>On deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages.</p>"}]}], "references": [{"url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/91"}], "credits": [{"lang": "en", "value": "Golan Myers", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 4.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-23T12:02:52.330281Z", "id": "CVE-2026-4983", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-23T12:03:13.663Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-4983", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-23T12:02:52.330281Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-23T12:03:09.532Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "Golan Myers"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/eclipse-openvsx/openvsx", "vendor": "Eclipse Foundation", "product": "Eclipse Open VSX", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "0.34.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/91"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with Content-Type: image/svg+xml without security headers such as Content-Security-Policy or Content-Disposition: attachment. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL.\n\n\n\n\nOn deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages.", "supportingMedia": [{"type": "text/html", "value": "<p>Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with <code>Content-Type: image/svg+xml</code> without security headers such as <code>Content-Security-Policy</code> or <code>Content-Disposition: attachment</code>. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL.</p>\n<p>On deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')"}]}], "providerMetadata": {"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse", "dateUpdated": "2026-06-23T10:50:38.938Z"}}}, "cveMetadata": {"cveId": "CVE-2026-4983", "state": "PUBLISHED", "dateUpdated": "2026-06-23T12:03:13.663Z", "dateReserved": "2026-03-27T12:31:27.749Z", "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "datePublished": "2026-06-23T10:50:38.938Z", "assignerShortName": "eclipse"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Eclipse Open VSX", "repo": "https://github.com/eclipse-openvsx/openvsx", "vendor": "Eclipse Foundation", "versions": [{"lessThan": "0.34.1", "status": "affected", "version": "0.1.0", "versionType": "semver"}]}], "source": "emo@eclipse.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:open_vsx:*:*:*:*:*:*:*:*", "matchCriteriaId": "B6474281-0832-4C15-98E7-2D434AF8832F", "versionEndExcluding": "0.34.1", "versionStartIncluding": "0.1.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Open VSX Registry does not sanitize SVG files uploaded as extension icons prior to storage, and serves them with Content-Type: image/svg+xml without security headers such as Content-Security-Policy or Content-Disposition: attachment. This allows an attacker to publish an extension with a malicious SVG icon and achieve stored cross-site scripting (XSS) when a user navigates directly to the icon URL.\n\n\n\n\nOn deployments using local storage, script execution occurs within the Open VSX application origin, enabling session hijacking, authentication token theft, and unauthorized extension publishing. On deployments backed by external storage (such as open-vsx.org with an S3-backed CDN), execution is confined to the storage origin, reducing impact but still permitting phishing attacks and credential harvesting through attacker-crafted pages."}, {"lang": "es", "value": "Open VSX Registry no sanitiza los archivos SVG subidos como iconos de extensi\u00f3n antes de su almacenamiento, y los sirve con Content-Type: image/svg+xml sin encabezados de seguridad como Content-Security-Policy o Content-Disposition: attachment. Esto permite a un atacante publicar una extensi\u00f3n con un icono SVG malicioso y lograr cross-site scripting (XSS) almacenado cuando un usuario navega directamente a la URL del icono.\n\nEn implementaciones que utilizan almacenamiento local, la ejecuci\u00f3n de scripts ocurre dentro del origen de la aplicaci\u00f3n Open VSX, lo que permite el secuestro de sesi\u00f3n, el robo de tokens de autenticaci\u00f3n y la publicaci\u00f3n no autorizada de extensiones. En implementaciones respaldadas por almacenamiento externo (como open-vsx.org con una CDN respaldada por S3), la ejecuci\u00f3n se limita al origen del almacenamiento, reduciendo el impacto pero a\u00fan permitiendo ataques de phishing y la recolecci\u00f3n de credenciales a trav\u00e9s de p\u00e1ginas creadas por el atacante."}], "id": "CVE-2026-4983", "lastModified": "2026-10-25T23:10:00.167", "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": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4983", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-23T12:02:52.330281Z", "version": "2.0.3"}}]}, "published": "2026-06-23T12:16:26.537", "references": [{"source": "emo@eclipse.org", "tags": ["Issue Tracking", "Vendor Advisory", "Exploit"], "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/91"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "emo@eclipse.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.0,0.34.1)"}}], "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": "2026-06-23T12:30:02.833435+00:00", "title": "Malicious SVG Icons Leading to Stored XSS in Eclipse Open VSX", "updated": "2026-06-23T14:15:04.668674+00:00", "vendors": ["eclipse", "eclipse$PRODUCT$open_vsx"]}