CVE-2026-14574

Process-wide logic alteration via prototype pollution

Published Aug 5, 2026 · Updated Aug 5, 2026

Prototype pollution in Eclipse Theia 0.7.0 through 1.73.1 allows attackers to alter application logic through crafted workspace settings. PreferenceUtils.merge in @theia/core recursively copies proto, constructor, and prototype keys into preference objects during PreferenceServiceImpl.doResolve, polluting Object.prototype. Exploitation requires a user to open an attacker-controlled workspace; the resulting inherited properties can influence objects throughout the Theia process.

CVSS severity5.7
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Eclipse Theia 0.7.0 through 1.73.1 allows attackers to alter application logic through crafted workspace settings. PreferenceUtils.merge in @theia/core recursively copies proto, constructor, and prototype keys into preference objects during PreferenceServiceImpl.doResolve, polluting Object.prototype. Exploitation requires a user to open an attacker-controlled workspace; the resulting inherited properties can influence objects throughout the Theia process.

The record

CVE
CVE-2026-14574
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Theia
Classifications
CWE-1321, T1204.002
Attack vector
local
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=0.7.0 <1.74.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Theiaversion=0.7.0 <1.74.0

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
5.7Eclipse FoundationCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:L/SA:L

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

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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