CVE-2026-18634

Unauthorized actions via insecure object deserialization

Published Aug 11, 2026 · Updated Aug 11, 2026

Insecure deserialization in SonicWall Global Management System 9.5.1 and earlier allows local users to perform unauthorized actions. An undisclosed GMS service insecurely handles serialized objects supplied through local service interaction, but SonicWall has not identified the service or serialization format. Local host access and the ability to interact with that service are required; the exact privilege level and bounded effect of the unauthorized actions remain undisclosed.

CVSS severity8.4
High
EPSS probability0.22%
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

Insecure deserialization in SonicWall Global Management System 9.5.1 and earlier allows local users to perform unauthorized actions. An undisclosed GMS service insecurely handles serialized objects supplied through local service interaction, but SonicWall has not identified the service or serialization format. Local host access and the ability to interact with that service are required; the exact privilege level and bounded effect of the unauthorized actions remain undisclosed.

The record

CVE
CVE-2026-18634
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
SonicWall
Product
Global Management System (GMS)
Classifications
CWE-502
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=9.5.1 and earlier versions

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

SonicWall · Global Management System (GMS)version=9.5.1 and earlier versions

Published CVSS scores

8.4CISA ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

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