CVE-2026-42473

Code execution via unchecked file deserialization

Published May 1, 2026 · Updated May 1, 2026

Unsafe deserialization in MixPHP Framework 2.x through 2.2.17 allows attackers to execute code through poisoned cache or session files. FileHandler reads serialized data from filesystem-backed session and cache storage and passes the bytes to PHP unserialize() without an integrity check or class allowlist. Reaching the sink requires the ability to create or alter a stored file; successful exploitation runs PHP code with the application process privileges.

CVSS severity9.8
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in MixPHP Framework 2.x through 2.2.17 allows attackers to execute code through poisoned cache or session files. FileHandler reads serialized data from filesystem-backed session and cache storage and passes the bytes to PHP unserialize() without an integrity check or class allowlist. Reaching the sink requires the ability to create or alter a stored file; successful exploitation runs PHP code with the application process privileges.

The record

CVE
CVE-2026-42473
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
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

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Your stack

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