CVE-2026-48106Network attack vector

Cluster data injection via unauthenticated replication messages

Published Aug 21, 2026 · Updated Aug 21, 2026

Missing message authentication in Basekick Labs Arc Enterprise before 2026.06.1 allows remote authenticated users to inject cluster data. The cluster replication receiver validates only message length and opcode, then accepts MsgReplicateSync payloads without an HMAC, signature, or nonce. A valid mTLS peer certificate and cluster-network access are required; crafted or replayed messages can insert, overwrite, or shadow replicated records.

CVSS severity8.3
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing message authentication in Basekick Labs Arc Enterprise before 2026.06.1 allows remote authenticated users to inject cluster data. The cluster replication receiver validates only message length and opcode, then accepts MsgReplicateSync payloads without an HMAC, signature, or nonce. A valid mTLS peer certificate and cluster-network access are required; crafted or replayed messages can insert, overwrite, or shadow replicated records.

The record

CVE
CVE-2026-48106
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
Basekick Labs
Product
Arc
Classifications
CWE-306, CWE-345, CWE-924, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=< 2026.06.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Basekick Labs · Arcversion=< 2026.06.1

Published CVSS scores

8.3GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-345Insufficient Verification of Data Authenticity
CWE-924Improper Enforcement of Message Integrity During Transmission in a Communication Channel
T1565.001Data Manipulation: Stored Data Manipulation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo