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    "cveMetadata": {
        "cveId": "CVE-2026-12609",
        "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "state": "PUBLISHED",
        "assignerShortName": "eclipse",
        "dateReserved": "2026-06-18T11:33:33.298Z",
        "datePublished": "2026-08-05T10:55:42.736Z",
        "dateUpdated": "2026-08-05T13:03:23.241Z"
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                            "cweId": "CWE-22",
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                    "capecId": "CAPEC-126",
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                            "lang": "en",
                            "value": "CAPEC-126"
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                    "vendor": "Eclipse Foundation",
                    "product": "Eclipse Theia",
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                            "version": "1.66.0",
                            "lessThan": "1.74.0",
                            "versionType": "semver"
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                {
                    "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.",
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            "references": [
                {
                    "url": "https://github.com/eclipse-theia/theia/security/advisories/GHSA-qmm6-p8q4-2g48"
                },
                {
                    "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/524"
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                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.5,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
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            "credits": [
                {
                    "lang": "en",
                    "value": "http://github.com/geo-chen",
                    "type": "finder"
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            "source": {
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                                "timestamp": "2026-08-05T13:03:16.183383Z",
                                "id": "CVE-2026-12609",
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                                        "Exploitation": "none"
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