CVE-2026-57713Network attack vector

Unauthenticated object injection through booking metadata deserialization

Published Jul 13, 2026 · Updated Jul 13, 2026

PHP object injection in Marcus Sykes Events Manager 7.3.6 and earlier allows remote attackers to inject objects through booking metadata. The plugin stores untrusted booking data as metadata and later deserializes it without restricting which PHP classes may be instantiated. Exploitation requires a public booking path, a later booking load by another user, and a suitable POP chain from another installed plugin or theme; Events Manager has no known chain.

CVSS severity8.8
High
EPSS probability0.46%
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 Marcus Sykes Events Manager 7.3.6 and earlier allows remote attackers to inject objects through booking metadata. The plugin stores untrusted booking data as metadata and later deserializes it without restricting which PHP classes may be instantiated. Exploitation requires a public booking path, a later booking load by another user, and a suitable POP chain from another installed plugin or theme; Events Manager has no known chain.

The record

CVE
CVE-2026-57713
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
Marcus Sykes
Product
Events Manager
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 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=0 <=7.3.6 changes=[{"at":"7.3.7","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marcus Sykes · Events Managerversion=0 <=7.3.6 changes=[{"at":"7.3.7","status":"unaffected"}]

Published CVSS scores

8.8PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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
CAPEC-586Object Injection
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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