How to fix CVE-2025-68853?

Within 24 hours: Identify all systems running Contact Manager versions ≤9.1.1 and isolate them from untrusted networks; disable remote access if possible. Within 7 days: Implement network segmentation to restrict Contact Manager traffic and apply WAF rules to block serialized object patterns; monitor for exploitation attempts. Within 30 days: Develop a migration plan to upgrade to patched versions once available; evaluate alternative contact management solutions if vendor remediation timeline is unclear.

Is Deserialization affected by CVE-2025-68853?

A critical deserialization vulnerability in Kleor Contact Manager (versions through 9.1.1) allows attackers to inject malicious objects, potentially leading to unauthorized access, data theft, or system compromise.

CVE-2025-68853

HIGH

2026-02-20 [email protected]

8.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 20, 2026 - 16:22 nvd

HIGH 8.8

Description

Deserialization of Untrusted Data vulnerability in Kleor Contact Manager contact-manager allows Object Injection.This issue affects Contact Manager: from n/a through <= 9.1.1.

Analysis

Deserialization of Untrusted Data vulnerability in Kleor Contact Manager contact-manager allows Object Injection.This issue affects Contact Manager: from n/a through <= 9.1.1. [CVSS 8.8 HIGH]

Technical Context

Classified as CWE-502 (Deserialization of Untrusted Data). Affects Kleor Contact Manager contact-manager. Deserialization of Untrusted Data vulnerability in Kleor Contact Manager contact-manager allows Object Injection.This issue affects Contact Manager: from n/a through <= 9.1.1.

Affected Products

Product: Kleor Contact Manager contact-manager.

Remediation

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +44

POC: 0

CVE-2025-68853 vulnerability details – vuln.today

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CVE-2025-68853

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Analysis

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CVE-2025-68853

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

Affected Products

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External POC / Exploit Code