CVE-2026-84207Public exploitNetwork attack vectorHinoki check available

Internal-service access via unguarded WebSocket dials

Published Sep 1, 2026 · Updated Sep 1, 2026

SSRF in Heym before 0.0.98 allows remote authenticated users to reach internal services through crafted WebSocket workflow nodes. The Send and Trigger paths pass attacker-controlled URLs and handshake headers directly to WebSocket connection calls without the existing egress guard. Any account can author these nodes; the Trigger returns internal WebSocket frames, while HTTP-only peers expose only a connection and service oracle.

CVSS severity5.4
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Heym before 0.0.98 allows remote authenticated users to reach internal services through crafted WebSocket workflow nodes. The Send and Trigger paths pass attacker-controlled URLs and handshake headers directly to WebSocket connection calls without the existing egress guard. Any account can author these nodes; the Trigger returns internal WebSocket frames, while HTTP-only peers expose only a connection and service oracle.

The record

CVE
CVE-2026-84207
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Heym
Product
Heym
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 1, 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=0 <0.0.98

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Heym · Heymversion=0 <0.0.98

Published CVSS scores

5.4HeymCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.3CISA-ADPCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

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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