CVE-2022-39297Network attack vector

PHP code execution via unrestricted object deserialization

Published Oct 12, 2022 · Updated Apr 23, 2025

Deserialization in Melis CMS 5.0.0 and earlier allows remote attackers to execute arbitrary PHP code via unauthenticated requests. FrontPluginsController, SitesConfigController, and SitesController pass serialized values to PHP unserialize() without disabling object instantiation. No authentication is required, and successful exploitation runs PHP code in the CMS server process.

CVSS severity9.8
Critical
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Melis CMS 5.0.0 and earlier allows remote attackers to execute arbitrary PHP code via unauthenticated requests. FrontPluginsController, SitesConfigController, and SitesController pass serialized values to PHP unserialize() without disabling object instantiation. No authentication is required, and successful exploitation runs PHP code in the CMS server process.

The record

CVE
CVE-2022-39297
Published
Oct 12, 2022
Updated
Apr 23, 2025
Vendor
Melis Technology
Product
Melis CMS
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 5.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Melis Technology · Melis CMSversion=<= 5.0.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

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.

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Technologies

Your stack

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Your stack

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