CVE-2025-39354Network attack vector

Unauthenticated object injection via unsafe deserialization

Published May 19, 2025 · Updated Apr 28, 2026

PHP object injection in ThemeGoods Grand Conference 5.3 and earlier allows remote attackers to inject objects via crafted network requests. Patchstack has not published the affected handler, attacker-controlled field, or specific unsafe deserialization call, so the code-level locus remains undisclosed. No authentication or user interaction is required, but follow-on code execution and other effects require a suitable POP chain.

CVSS severity9.8
Critical
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 ThemeGoods Grand Conference 5.3 and earlier allows remote attackers to inject objects via crafted network requests. Patchstack has not published the affected handler, attacker-controlled field, or specific unsafe deserialization call, so the code-level locus remains undisclosed. No authentication or user interaction is required, but follow-on code execution and other effects require a suitable POP chain.

The record

CVE
CVE-2025-39354
Published
May 19, 2025
Updated
Apr 28, 2026
Vendor
Altair GraphQL
Product
Grand Conference
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2025CVE 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=0 <=5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Altair GraphQL · Grand Conferenceversion=0 <=5.3

Published CVSS scores

9.8PatchstackCVSS: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
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

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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