CVE-2026-61554Network attack vectorHinoki check available

Unauthenticated service interruption via pre-auth polling sessions

Published Sep 15, 2026 · Updated Sep 15, 2026

Improper authentication in jm33-m0 emp3r0r before 4.2.5 allows remote attackers to interrupt service through crafted HTTP polling. The http_poll transport creates attacker-controlled polling sessions and forwards request bodies into C2 dispatch before CBOR MsgAuth validation completes. No credentials are required; repeated sessions consume server resources and invoke pre-authentication C2 processing, interrupting the C2 service.

CVSS severityUnavailable
Unscored
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authentication in jm33-m0 emp3r0r before 4.2.5 allows remote attackers to interrupt service through crafted HTTP polling. The http_poll transport creates attacker-controlled polling sessions and forwards request bodies into C2 dispatch before CBOR MsgAuth validation completes. No credentials are required; repeated sessions consume server resources and invoke pre-authentication C2 processing, interrupting the C2 service.

The record

CVE
CVE-2026-61554
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
jm33-m0
Product
emp3r0r
Classifications
T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 4.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

jm33-m0 · emp3r0rversion=< 4.2.5

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.003Application Exhaustion Flood

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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