CVE-2024-28405Public exploitNetwork attack vector

Unauthenticated administrator creation via pre-auth function dispatch

Published Mar 29, 2024 · Updated Aug 2, 2024

Improper access control in SEMCMS 4.8 allows remote attackers to create administrator accounts through the admin request handler. SEMCMS_Top_include.php loads SEMCMS_Function.php and dispatches CF=user and Class=add before checkuser validates an administrator session. An unauthenticated POST with the required account fields reaches AntAdd and writes a new sc_user record, after which the attacker can sign in with administrator privileges.

CVSS severity7.2
High
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in SEMCMS 4.8 allows remote attackers to create administrator accounts through the admin request handler. SEMCMS_Top_include.php loads SEMCMS_Function.php and dispatches CF=user and Class=add before checkuser validates an administrator session. An unauthenticated POST with the required account fields reaches AntAdd and writes a new sc_user record, after which the attacker can sign in with administrator privileges.

The record

CVE
CVE-2024-28405
Published
Mar 29, 2024
Updated
Aug 2, 2024
Vendor
Sem-Cms
Product
SEMCMS
Classifications
CWE-284, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 29, 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=4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sem-Cms · SEMCMSversion=4.8

Published CVSS scores

7.2CISA ADPCVSS:3.1/AV:N/AC:L/PR:H/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1136Create Account

Public exploit references

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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