CVE-2025-48951Network attack vector

Unauthenticated object injection via serialized cookie data

Published Jun 3, 2025 · Updated Jun 4, 2025

Deserialization of untrusted data in Auth0 Auth0-PHP 8.0.0-BETA3 through 8.3.0 allows remote attackers to inject PHP objects via cookies. CookieStore::decrypt decodes attacker-controlled cookie content and passes it to unserialize before authentication, allowing object instantiation from serialized payloads. No account or user interaction is required; reachable gadget classes determine whether object injection changes data, executes code, or interrupts the application.

CVSS severity9.3
Critical
EPSS probability0.75%
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 Auth0 Auth0-PHP 8.0.0-BETA3 through 8.3.0 allows remote attackers to inject PHP objects via cookies. CookieStore::decrypt decodes attacker-controlled cookie content and passes it to unserialize before authentication, allowing object instantiation from serialized payloads. No account or user interaction is required; reachable gadget classes determine whether object injection changes data, executes code, or interrupts the application.

The record

CVE
CVE-2025-48951
Published
Jun 3, 2025
Updated
Jun 4, 2025
Vendor
Auth0
Product
Auth0-PHP
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2025Record 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=>= 8.0.0-BETA3, < 8.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Auth0 · Auth0-PHPversion=>= 8.0.0-BETA3, < 8.3.1

Published CVSS scores

9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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