CVE-2026-60009Public exploitNetwork attack vector

Unauthenticated file write via unrestricted upload path

Published Aug 5, 2026 · Updated Aug 5, 2026

Arbitrary file write in Eclipse Theia 1.73.1 and earlier allows remote attackers to overwrite backend-writable files via /file-upload. The @theia/filesystem handler passes the multipart uri value to fs.move with overwrite enabled, without authentication or workspace confinement. In browser deployments, visiting an attacker-controlled page can trigger a CORS-safelisted request; Electron mode is excluded, and code execution requires overwriting a file later executed by the backend account.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in Eclipse Theia 1.73.1 and earlier allows remote attackers to overwrite backend-writable files via /file-upload. The @theia/filesystem handler passes the multipart uri value to fs.move with overwrite enabled, without authentication or workspace confinement. In browser deployments, visiting an attacker-controlled page can trigger a CORS-safelisted request; Electron mode is excluded, and code execution requires overwriting a file later executed by the backend account.

The record

CVE
CVE-2026-60009
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Theia
Classifications
CWE-306, CWE-22, CWE-352, CWE-73, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.74.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Theiaversion=0 <1.74.0

Published CVSS scores

8.8Eclipse FoundationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-352Cross-Site Request Forgery (CSRF)
CWE-73External Control of File Name or Path
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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