CVE-2026-10054Network attack vector

Command execution via cross-origin terminal WebSockets

Published Jul 3, 2026 · Updated Jul 3, 2026

Command execution in Eclipse Theia 1.8.1 through 1.72.3 allows remote attackers to run OS commands through terminal WebSockets. The browser backend registers unauthenticated terminal RPC, accepts missing origins, and replaces Origin with the client-controlled fix-origin header. A user must visit a foreign-origin page while a reachable Theia browser application is running; the page can create a terminal, execute commands, and read output.

CVSS severity8.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command execution in Eclipse Theia 1.8.1 through 1.72.3 allows remote attackers to run OS commands through terminal WebSockets. The browser backend registers unauthenticated terminal RPC, accepts missing origins, and replaces Origin with the client-controlled fix-origin header. A user must visit a foreign-origin page while a reachable Theia browser application is running; the page can create a terminal, execute commands, and read output.

The record

CVE
CVE-2026-10054
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Theia
Classifications
CWE-1385, CWE-306, T1059, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 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=1.8.1 <1.73.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Theiaversion=1.8.1 <1.73.0

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1385Missing Origin Validation in WebSockets
CWE-306Missing Authentication for Critical Function
T1059Command and Scripting Interpreter
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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