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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History
Wed, 05 Aug 2026 13:30:00 +0000
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ssvc
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Wed, 05 Aug 2026 12:45:00 +0000
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| Title | Unauthenticated Path Traversal in Theia Hosted Plugin Endpoint |
Wed, 05 Aug 2026 11:15:00 +0000
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| Description | 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. | |
| Weaknesses | CWE-22 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: eclipse
Published:
Updated: 2026-08-05T13:03:23.241Z
Reserved: 2026-06-18T11:33:33.298Z
Link: CVE-2026-12609
Updated: 2026-08-05T13:03:19.995Z
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OpenCVE Enrichment
Updated: 2026-08-05T12:30:12Z
Weaknesses