CVE-2024-27187Network attack vector

Authenticated username overwrite via backend profile ACL

Published Aug 20, 2024 · Updated Aug 22, 2024

Improper access control in Joomla! CMS 4.0.0 through 4.4.6 and 5.0.0 through 5.1.2 allows remote authenticated users to change a username. The backend profile view accepts and persists a supplied username despite the applicable access-control decision; public sources do not identify the responsible function. Administrator-backend access is required, and the documented consequence is limited to overwriting the authenticated account's username.

CVSS severity7.5
High
EPSS probability0.35%
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 Joomla! CMS 4.0.0 through 4.4.6 and 5.0.0 through 5.1.2 allows remote authenticated users to change a username. The backend profile view accepts and persists a supplied username despite the applicable access-control decision; public sources do not identify the responsible function. Administrator-backend access is required, and the documented consequence is limited to overwriting the authenticated account's username.

The record

CVE
CVE-2024-27187
Published
Aug 20, 2024
Updated
Aug 22, 2024
Vendor
Joomla
Product
Joomla! CMS
Classifications
CWE-284, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=4.0.0 <=4.4.6
  2. Affected versionversion=5.0.0 <=5.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Joomla · Joomla! CMSversion=4.0.0 <=4.4.6; version=5.0.0 <=5.1.2
Joomla! Project · Joomla! CMSversion=4.0.0-4.4.6; version=5.0.0-5.1.2

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1098Account Manipulation

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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