CVE-2026-84197Network attack vector

Traffic interception via disabled WebSocket certificate validation

Published Sep 8, 2026 · Updated Sep 9, 2026

Improper certificate validation in affected Eclipse Ditto Node.js clients allows attackers to intercept and alter WSS traffic. The WebSocket transport passes rejectUnauthorized as false to ws, disabling certificate-chain and hostname checks without an application override. An attacker positioned on the connection path can supply any certificate, capture Authorization-header credentials, and read, modify, or inject Ditto Protocol messages.

CVSS severity9.2
Critical
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in affected Eclipse Ditto Node.js clients allows attackers to intercept and alter WSS traffic. The WebSocket transport passes rejectUnauthorized as false to ws, disabling certificate-chain and hostname checks without an application override. An attacker positioned on the connection path can supply any certificate, capture Authorization-header credentials, and read, modify, or inject Ditto Protocol messages.

The record

CVE
CVE-2026-84197
Published
Sep 8, 2026
Updated
Sep 9, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Ditto
Classifications
CWE-297, CWE-295, CWE-300, CAPEC-117, CAPEC-94, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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=1.0.0 <=2.1.0
  2. Affected versionversion=2.0.0 <3.8.1
  3. Affected versionversion=3.9.0 <3.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Dittoversion=1.0.0 <=2.1.0; version=2.0.0 <3.8.1; version=3.9.0 <3.9.1

Published CVSS scores

9.2Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-297Improper Validation of Certificate with Host Mismatch
CWE-295Improper Certificate Validation
CWE-300Channel Accessible by Non-Endpoint
CAPEC-117Interception
CAPEC-94Adversary in the Middle (AiTM)
T1557Adversary-in-the-Middle

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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