CVE-2023-6451Network attack vector

Authentication bypass via forged machine-key cookies

Published Feb 16, 2024 · Updated Aug 2, 2024

Authentication bypass in AlayaCare Procura Portal before 9.0.1.2 allows remote attackers to access application data with forged cookies. The application's web.config uses a publicly known static machine key to validate and decrypt attacker-created authentication cookies. No credentials or user interaction are required, and successful forgery grants access to the portal and its protected data.

CVSS severity8.6
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in AlayaCare Procura Portal before 9.0.1.2 allows remote attackers to access application data with forged cookies. The application's web.config uses a publicly known static machine key to validate and decrypt attacker-created authentication cookies. No credentials or user interaction are required, and successful forgery grants access to the portal and its protected data.

The record

CVE
CVE-2023-6451
Published
Feb 16, 2024
Updated
Aug 2, 2024
Vendor
AlayaCare
Product
Procura Portal
Classifications
CWE-1394, CWE-287, CAPEC-115, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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 <9.0.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AlayaCare · Procura Portalversion=0 <9.0.1.2

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6The Missing Link AustraliaCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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.

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-1394Use of Default Cryptographic Key
CWE-287Improper Authentication
CAPEC-115Authentication Bypass
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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