CVE-2025-47275Network attack vector

Unauthorized session access via truncated authentication tags

Published May 15, 2025 · Updated May 22, 2025

Improper authentication in Auth0-PHP 8.0.0-BETA1 and later before 8.14.0 allows remote attackers to gain unauthorized access via session cookies. CookieStore::decrypt accepted any base64-decoded authentication tag length and passed shortened tags to AES-128-GCM decryption, reducing the work needed to guess a valid tag. Exposure requires an affected SDK and CookieStore-backed session storage; a forged cookie can impersonate a valid session.

CVSS severity9.1
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Auth0-PHP 8.0.0-BETA1 and later before 8.14.0 allows remote attackers to gain unauthorized access via session cookies. CookieStore::decrypt accepted any base64-decoded authentication tag length and passed shortened tags to AES-128-GCM decryption, reducing the work needed to guess a valid tag. Exposure requires an affected SDK and CookieStore-backed session storage; a forged cookie can impersonate a valid session.

The record

CVE
CVE-2025-47275
Published
May 15, 2025
Updated
May 22, 2025
Vendor
Auth0
Product
Auth0-PHP
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. May 22, 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-BETA1, < 8.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Auth0 · Auth0-PHPversion=>= 8.0.0-BETA1, < 8.14.0

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

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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-287Improper Authentication
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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