How to fix CVE-2025-56422?

Within 24 hours: Identify all LimeSurvey instances in your environment and document their versions and network exposure; isolate affected systems from production networks if possible and restrict access to LimeSurvey to trusted IP ranges only. Within 7 days: Implement Web Application Firewall (WAF) rules to block deserialization payloads; consider disabling LimeSurvey services if non-critical; establish 24/7 monitoring for exploitation attempts (check logs for suspicious requests and code execution patterns). Within 30 days: Upgrade to LimeSurvey v6.15.0+250623 or later once available; perform forensic analysis of server logs and system activity for indicators of compromise; conduct security assessment of potentially affected systems.

Is Deserialization affected by CVE-2025-56422?

A critical remote code execution vulnerability in LimeSurvey (CVE-2025-56422, CVSS 9.8) allows attackers to execute arbitrary commands on affected servers without authentication.

CVE-2025-56422

CRITICAL

2026-03-10 [email protected]

9.8

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Mar 10, 2026 - 18:17 nvd

CRITICAL 9.8

Description

A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitrary code on the server.

Analysis

LimeSurvey before v6.15.0 has an insecure deserialization enabling remote code execution through crafted survey data.

Technical Context

LimeSurvey < 6.15.0 has a CWE-502 deserialization vulnerability allowing RCE through crafted survey data.

Affected Products

['LimeSurvey < 6.15.0+250623']

Remediation

Update LimeSurvey.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +49

POC: 0

CVE-2025-56422 vulnerability details – vuln.today

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CVE-2025-56422

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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CVE-2025-56422

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

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External POC / Exploit Code