How broadly exploitable is this vulnerability?

Exploitation is limited to authenticated users who can influence settings handled by AbstractSettingsCollection, but within that scope it can reliably lead to arbitrary file write and remote code execution, giving it a high impact in shared or multi-user environments.

Does an attacker need administrative access to exploit this?

Not necessarily. The key requirement is the ability to create or modify a setting that is persisted and later deserialized; depending on how permissions are configured, non-admin users with access to relevant settings interfaces may be able to exploit the issue.

What is the safest general fix pattern for developers?

Replace unsafe object deserialization with simple, strongly typed configuration storage (e.g., primitives, arrays, and objects encoded in JSON) and remove any need to deserialize arbitrary objects from settings, while also ensuring that configuration data cannot directly control file paths or similar sensitive behaviors.

Severity:

CRITICAL RISK

(9.9)

Insecure Deserialization (CWE-502) in Group-Office AbstractSettingsCollection Enables Arbitrary File Write and RCE

CVE-2026-34838

Published:

Apr 2, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution via Arbitrary File Write

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution via Arbitrary File Write

Severity:

CRITICAL RISK

(9.9)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Insecure Deserialization (CWE-502) in Group-Office AbstractSettingsCollection Enables Arbitrary File Write and RCE

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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