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vuln-cve/data/2026/12xxx/CVE-2026-12609.json
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"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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"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": [
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"url": "https://github.com/eclipse-theia/theia/security/advisories/GHSA-qmm6-p8q4-2g48"
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{
"url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/524"
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"url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/133"
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"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": {
"discovery": "UNKNOWN"
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"timestamp": "2026-08-05T13:03:16.183383Z",
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"role": "CISA Coordinator",
"version": "2.0.3"
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"title": "CISA ADP Vulnrichment",
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