CVE-2026-12609

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.

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Produits concernés

• Eclipse Foundation Eclipse Theia
• Eclipse theia

Scores CVSS

Faiblesses (CWE)

• CWE-22

Références

• https://github.com/eclipse-theia/theia/security/advisories/GHSA-qmm6-p8q4-2g48 Broken Link
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/133 Vendor Advisory
• https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/524 Issue TrackingMitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories