CVE-2023-51414Network attack vector

Unauthenticated object injection via unsafe token deserialization

Published Dec 29, 2023 · Updated Apr 28, 2026

PHP object injection in EnvíaloSimple: Email Marketing y Newsletters 2.1 and earlier allows remote attackers to instantiate objects via a crafted token. The frontend subscription handler in pages/frontend/suscription.php passes the token parameter to unserialize() without disabling class instantiation. A victim must open the crafted subscription link, after which available WordPress or plugin classes can have magic methods invoked; no specific gadget chain or resulting action is public.

CVSS severity9.6
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in EnvíaloSimple: Email Marketing y Newsletters 2.1 and earlier allows remote attackers to instantiate objects via a crafted token. The frontend subscription handler in pages/frontend/suscription.php passes the token parameter to unserialize() without disabling class instantiation. A victim must open the crafted subscription link, after which available WordPress or plugin classes can have magic methods invoked; no specific gadget chain or resulting action is public.

The record

CVE
CVE-2023-51414
Published
Dec 29, 2023
Updated
Apr 28, 2026
Vendor
EnvíaloSimple
Product
EnvíaloSimple: Email Marketing y Newsletters
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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?

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

  1. Affected versionversion=n/a <=2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EnvíaloSimple · EnvíaloSimple: Email Marketing y Newslettersversion=n/a <=2.1

Published CVSS scores

9.6PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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