CVE-2025-56422Network attack vector

Unauthenticated code execution via token-attribute deserialization

Published Mar 10, 2026 · Updated Mar 10, 2026

Deserialization in LimeSurvey before 6.15.0+250623 allows remote attackers to execute arbitrary code on the server through survey imports. The survey-import path passes user-controlled legacy token attribute data to PHP unserialize(), permitting object instantiation and autoloading. No authentication or user interaction is required; successful exploitation runs code in the LimeSurvey application context.

CVSS severity9.8
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in LimeSurvey before 6.15.0+250623 allows remote attackers to execute arbitrary code on the server through survey imports. The survey-import path passes user-controlled legacy token attribute data to PHP unserialize(), permitting object instantiation and autoloading. No authentication or user interaction is required; successful exploitation runs code in the LimeSurvey application context.

The record

CVE
CVE-2025-56422
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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

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Your stack

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