CVE-2026-12609

{"id": "CVE-2026-12609", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12609", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-05T13:03:16.183383Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "emo@eclipse.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "emo@eclipse.org", "affectedData": [{"vendor": "Eclipse Foundation", "product": "Eclipse Theia", "versions": [{"status": "affected", "version": "1.66.0", "lessThan": "1.74.0", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-05T11:16:24.080", "references": [{"url": "https://github.com/eclipse-theia/theia/security/advisories/GHSA-qmm6-p8q4-2g48", "tags": ["Broken Link"], "source": "emo@eclipse.org"}, {"url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/133", "tags": ["Vendor Advisory"], "source": "emo@eclipse.org"}, {"url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/524", "tags": ["Issue Tracking", "Mitigation", "Vendor Advisory"], "source": "emo@eclipse.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "emo@eclipse.org", "description": [{"lang": "en", "value": "CWE-22"}]}], "descriptions": [{"lang": "en", "value": "In Eclipse Theia versions 1.66.0 and up until including 1.73.1, the `@theia/plugin-ext` backend exposes the `/hostedPlugin/:pluginId/:path(*)` HTTP endpoint, which resolves the requested file path with `path.resolve(localPath, filePath)` without verifying that the resolved path stays within the plugin's directory. An unauthenticated network attacker can send percent-encoded `../` sequences (`%2e%2e%2f`) that decode into the path parameter and escape the plugin directory, allowing arbitrary files readable by the Theia backend process to be retrieved. Plugin IDs are derived deterministically from a plugin's publisher and name, so built-in plugins serve as reliable anchors that require no prior knowledge of the target system."}, {"lang": "es", "value": "En las versiones de Eclipse Theia 1.66.0 y hasta la 1.73.1 inclusive, el backend \u201c@theia/plugin-ext\u201d expone el endpoint HTTP \u201c/hostedPlugin/:pluginId/:path(*)\u201d, que resuelve la ruta de archivo solicitada con \u201cpath.resolve(localPath, filePath)\u201d sin verificar que la ruta resuelta permanezca dentro del directorio del plugin. Un atacante de red no autenticado puede enviar secuencias \u201c.. / \u201d codificadas en porcentaje (\u201c%2e%2e%2f\u201d) que se decodifican en el par\u00e1metro de ruta y escapan del directorio del plugin, permitiendo la recuperaci\u00f3n de archivos arbitrarios legibles por el proceso de backend de Theia. Los ID de plugin se derivan de forma determinista del editor y el nombre de un plugin, por lo que los plugins integrados sirven como anclajes fiables que no requieren conocimiento previo del sistema objetivo."}], "lastModified": "2026-10-23T21:10:00.157", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80478E2F-D9E2-4668-86CF-67913770E0AC", "versionEndExcluding": "1.74.0", "versionStartIncluding": "1.66.0"}], "operator": "OR"}]}], "sourceIdentifier": "emo@eclipse.org"}