Joomla\!Application · Joomla
CVE-2024-27187
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper Access Controls allows backend users to overwrite their username when disallowed.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceImproper access control allows authenticated backend users to modify their own username even when this action should be restricted. This is likely an IDOR (Insecure Direct Object Reference) or missing authorization check in the user profile/update endpoint that fails to enforce permissions preventing username changes.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Joomla\!Application
>= 4.0.0, < 4.4.7>= 5.0.0, < 5.1.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the installed Joomla versionCheck the version.php file in the /libraries/src/Version.php path or look at the administrator/aboutjoomla.xml file. Alternatively, log into the backend and check the system information page.Affected if The installed version is >= 4.0.0 and < 4.4.7, OR >= 5.0.0 and < 5.1.3
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Confirm backend user access existsVerify that there are users with backend/administrator access in the Joomla user manager (Users > Manage). This vulnerability requires an authenticated backend user.Affected if There are active users with Super Admin, Administrator, or Manager-level backend access privileges
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Verify username change restrictions are in placeCheck if any user group permission configurations exist that are intended to restrict username changes. Review the user options in Backend > Users > Options > User Options to see if username editing is meant to be restricted.Affected if Administrative restrictions on username changes exist but the above vulnerable versions are installed, meaning the restriction may not be enforced
A user is affected if they are running Joomla version 4.0.0 through 4.4.6 or 5.0.0 through 5.1.2 AND have authenticated backend user accounts, as the authorization check preventing username changes is missing.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.4.75.1.3
Implement proper authorization checks to verify whether a user has permission to modify their username, and enforce any administrative restrictions on username changes at the service layer.
Joomla 4.4.7 or Joomla 5.1.3 (depending on your current major version)
- Back up your Joomla! site database and files before making any changes
- Review the Joomla! documentation for upgrading at docs.joomla.org
- Download Joomla! 4.4.7 (for 4.x installations) or Joomla! 5.1.3 (for 5.x installations) from the official Joomla! downloads page
- Follow the standard Joomla! upgrade procedure: either use the Joomla! Update component within the admin panel or manually replace core files
- After upgrading, verify that the access control issue is resolved by testing user account management functionality
- Confirm that your extensions and templates are still functional after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Joomla\!
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-27187 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-27187 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data