CVE-2026-82217Public exploitNetwork attack vector

Backend code execution via Agent Mode path traversal

Published Aug 31, 2026 · Updated Sep 1, 2026

Path traversal in Eclipse Theia 1.73.0 and later, before 1.75.0, allows remote attackers to write or delete files outside the workspace. The file-change handlers passed model-supplied relative, absolute, or home-expanded paths to a raw resolver and then to write or delete sinks without verifying workspace containment. A user must expose Agent Mode to attacker-influenced content; writes require no confirmation, and changing a host-executed file grants backend code execution.

CVSS severity8.8
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Eclipse Theia 1.73.0 and later, before 1.75.0, allows remote attackers to write or delete files outside the workspace. The file-change handlers passed model-supplied relative, absolute, or home-expanded paths to a raw resolver and then to write or delete sinks without verifying workspace containment. A user must expose Agent Mode to attacker-influenced content; writes require no confirmation, and changing a host-executed file grants backend code execution.

The record

CVE
CVE-2026-82217
Published
Aug 31, 2026
Updated
Sep 1, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Theia
Classifications
CWE-22, CAPEC-126, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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=1.73.0 <1.75.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Theiaversion=1.73.0 <1.75.0

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-126Path Traversal
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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