CVE-2026-23520Public exploitNetwork attack vector

Authenticated RCE via updater lifecycle shell injection

Published Jan 15, 2026 · Updated Jan 15, 2026

OS command injection in Arcane before 1.13.0 allows remote authenticated users to execute shell commands through updater lifecycle labels. The updater service reads pre-update or post-update label values and passes them directly to /bin/sh -c without validation or neutralization. Any authenticated user can plant a command through the project API, but an administrator must later trigger an update; execution occurs inside the container, with host access limited to exposed mounts.

CVSS severity9.0
Critical
EPSS probability1.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Arcane before 1.13.0 allows remote authenticated users to execute shell commands through updater lifecycle labels. The updater service reads pre-update or post-update label values and passes them directly to /bin/sh -c without validation or neutralization. Any authenticated user can plant a command through the project API, but an administrator must later trigger an update; execution occurs inside the container, with host access limited to exposed mounts.

The record

CVE
CVE-2026-23520
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Arcane
Product
Arcane
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arcane · Arcaneversion=< 1.13.0

Published CVSS scores

8.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

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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