CVE-2025-39500Network attack vector

Unauthenticated PHP object injection

Published May 23, 2025 · Updated Apr 28, 2026

Deserialization of untrusted data in GoodLayers Hostel 3.1.2 and earlier allows remote attackers to inject PHP objects via network requests. The CNA and linked Patchstack advisory do not disclose the affected endpoint, parameter, or code path that deserializes attacker-controlled data. No authentication or user interaction is required, but the public record identifies neither a usable gadget chain nor a specific resulting action.

CVSS severity9.8
Critical
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in GoodLayers Hostel 3.1.2 and earlier allows remote attackers to inject PHP objects via network requests. The CNA and linked Patchstack advisory do not disclose the affected endpoint, parameter, or code path that deserializes attacker-controlled data. No authentication or user interaction is required, but the public record identifies neither a usable gadget chain nor a specific resulting action.

The record

CVE
CVE-2025-39500
Published
May 23, 2025
Updated
Apr 28, 2026
Vendor
GoodLayers
Product
Goodlayers Hostel
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 23, 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 <=3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoodLayers · Goodlayers Hostelversion=0 <=3.1.2

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
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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