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CVE-2026-12609

Quick assessment

Affected
Eclipse Foundation Eclipse Theia
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Eclipse Theia是美国Eclipse基金会开源的一个可构建云端及桌面集成开发环境的开发框架。 Eclipse Theia 1.66.0版本至1.73.1版本存在路径遍历漏洞，该漏洞源于@theia/plugin-ext后端在通过/hostedPlugin/:pluginId/:path(*)接口解析文件路径时未验证路径是否在插件目录内，未经身份验证的攻击者可通过发送百分号编码的 序列（ ）逃离插件目录，导致读取后端进程可访问的任意文件。

CVSS 7.5 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Theia 1.66.0< 1.74.0 affected
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I. Basic Information for CVE-2026-12609

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Eclipse Theia 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Theia是美国Eclipse基金会开源的一个可构建云端及桌面集成开发环境的开发框架。 Eclipse Theia 1.66.0版本至1.73.1版本存在路径遍历漏洞，该漏洞源于@theia/plugin-ext后端在通过/hostedPlugin/:pluginId/:path(*)接口解析文件路径时未验证路径是否在插件目录内，未经身份验证的攻击者可通过发送百分号编码的`../`序列（`%2e%2e%2f`）逃离插件目录，导致读取后端进程可访问的任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse Theia 1.66.0 ~ 1.74.0 -

II. Public POCs for CVE-2026-12609

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6043 chars
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In-depth vulnerability mechanism
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POC zip download
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III. Intelligence Information for CVE-2026-12609

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Patches & Fixes for CVE-2026-12609 (1)

Vendor Advisories for CVE-2026-12609 (2)

Same Patch Batch · Eclipse Foundation · 2026-08-05 · 6 CVEs total

CVE-2026-60009 8.8 HIGH Eclipse Theia 路径遍历漏洞
CVE-2026-61891 7.5 HIGH Eclipse Theia 信息泄露漏洞
CVE-2026-14574 5.7 MEDIUM Eclipse Theia 输入验证错误漏洞
CVE-2026-14304 4.6 MEDIUM Eclipse Accessibility Tools Framework 输入验证错误漏洞
CVE-2026-46581 Eclipse Mojarra 路径遍历漏洞

IV. Related Vulnerabilities

Same product: Eclipse Theia
Same vendor: Eclipse Foundation
Same weakness: CWE-22

V. Comments for CVE-2026-12609

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