CVE-2026-23944Network attack vector

Unauthenticated remote-environment access via pre-authentication proxying

Published Jan 19, 2026 · Updated Jan 19, 2026

Authentication bypass in Arcane before 1.13.2 allows remote attackers to access remote environment resources through the manager proxy. EnvironmentMiddleware processes nonlocal environment paths and attaches the stored agent token before validating the caller's API key, bearer token, or session. A configured remote environment makes its agent operations reachable without credentials, enabling resource reads, unauthorized changes, or service interruption.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Arcane before 1.13.2 allows remote attackers to access remote environment resources through the manager proxy. EnvironmentMiddleware processes nonlocal environment paths and attaches the stored agent token before validating the caller's API key, bearer token, or session. A configured remote environment makes its agent operations reachable without credentials, enabling resource reads, unauthorized changes, or service interruption.

The record

CVE
CVE-2026-23944
Published
Jan 19, 2026
Updated
Jan 19, 2026
Vendor
Arcane
Product
Arcane
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 19, 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=< 1.13.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arcane · Arcaneversion=< 1.13.2

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

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 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-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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