Subscriber-level PHP object injection
Published Jun 25, 2026 · Updated Jun 25, 2026
PHP object injection in Metagauss EventPrime 4.3.4.1 and earlier allows remote authenticated users to inject PHP objects. The CNA and its sole referenced advisory do not disclose the affected function, input field, or operation that deserializes attacker-controlled data. Subscriber-level access is required, and further code execution or other secondary effects require a usable POP chain in the site's PHP object graph.
Summary
What happened
PHP object injection in Metagauss EventPrime 4.3.4.1 and earlier allows remote authenticated users to inject PHP objects. The CNA and its sole referenced advisory do not disclose the affected function, input field, or operation that deserializes attacker-controlled data. Subscriber-level access is required, and further code execution or other secondary effects require a usable POP chain in the site's PHP object graph.
The record
- CVE
- CVE-2026-56053
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- EventPrime Events
- Product
- EventPrime
- Classifications
- CWE-502, CAPEC-586
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 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.
- Affected versionversion=n/a <=4.3.4.1 changes=[{"at":"4.3.4.2","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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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