If your Joomla website uses the JCE Editor extension, CVE-2026-48907 needs your attention today and not at the end of the week, because it is an actively exploited vulnerability that requires no administrator login. Attackers can reach a restricted part of JCE from the outside, create a malicious editor profile and upload a PHP web shell to your server without a single valid password. The vulnerability was patched in June 2026, however, patching alone does not clean a site that was already hit, so your Joomla website can be compromised right now even if the front end looks normal.
As a Canadian web design company, IDL Web Inc can check, clean and secure your Joomla website after the JCE Editor vulnerability, ask for a FREE audit or a FREE quote and we will tell you exactly what was found.
What CVE-2026-48907 Actually Does
The vulnerability is an improper access control flaw, which means a part of JCE that should only be available to logged-in administrators can be reached by anyone, including unauthenticated visitors. The attack path is short and fully automated:
- The attacker sends a request to the JCE profile import endpoint with no login required.
- A rogue editor profile is created or imported that re-enables dangerous upload types, including .php files, with MIME validation turned off.
- The attacker uploads a PHP web shell through that profile.
- The shell sits in a publicly accessible folder such as /images, /media or /tmp and waits.
- The attacker runs the shell from a browser and can execute code on your server.
From there the possibilities are serious, such as stolen database credentials, added administrator accounts, modified files, injected malware, email spam, redirects and backdoors that survive a simple extension update. CVE-2026-48907 affects Joomla sites running JCE 2.9.99.4 and earlier.
Why This Is More Serious Than a Routine Update
Four things make CVE-2026-48907 worth treating urgently.
No login is required
It requires nothing from your visitors or users.
The exploit code is public
Working attack code has been available on GitHub since June 9, 2026. Anyone can run it against any JCE website, so a site that stays unpatched is exposed to automated attacks.
It is actively exploited
CISA added CVE-2026-48907 to its Known Exploited Vulnerabilities catalog on June 16, 2026 and it only lists a vulnerability when it has confirmed evidence of exploitation in the wild.
Patching is not cleaning
Updating JCE to 2.9.99.7 closes the door but it does not remove rogue profiles, web shells or backdoor files that were placed before the update.
Affected JCE Versions
JCE versions 1.0.0 through 2.9.99.4 carry the vulnerability and the fix was released in three stages:
- 2.9.99.5 on June 3, 2026: the initial security patch closing CVE-2026-48907.
- 2.9.99.7 on June 18, 2026: fixes an upload regression from 2.9.99.6 and adds a permitted user groups whitelist. This is the recommended version.
Update to 2.9.99.7 and if you still run 2.9.99.5 or 2.9.99.6 update regardless. Sites on JCE 2.7.x or 2.8.x that cannot update immediately can use the free security patch package from the JCE developer and then plan a full update.
Not sure if your Joomla site was affected?
IDL Web Inc scans for rogue JCE profiles, web shells and backdoor files across your entire portfolio and tells you exactly what you are dealing with.
How to Tell If Your Site Was Compromised
Updating is the first step and checking for compromise is the second.
Look in JCE Editor profiles first
Go to Components, JCE Editor, Editor Profiles and review every profile. Look for profiles you did not create, profiles where PHP, phtml or txt files appear in the permitted upload types with MIME validation disabled.
Check your files next
PHP files should not be inside /images, /media, /tmp or /cache, so treat them as suspicious. Common indicators are files with eval(gzinflate(base64_decode(…))) patterns and files referencing shell_exec, system or passthru.
Review your server access logs
Look for POST requests to the JCE profile import endpoint. The earliest matching request tells you when the attack reached your site.
Check your administrator user list
Go to User Manager and look for accounts you do not recognize. Attackers routinely add super-administrator accounts once they have shell access. Remove every account you cannot explain and reset the passwords of the ones you keep.
How to Fix It: The Complete Sequence
Work through these steps in this order.
Update JCE immediately
Go to Administrator, System, Update, Extensions and install JCE 2.9.99.7 or the latest available version. If the update does not appear, download it from the official JCE website and install it manually.
Update Joomla core
Do not stop at the extension, because an updated CMS reduces the overall attack surface. Install the latest Joomla version from the Update screen and check that your other extensions are current.
Delete rogue JCE profiles
Remove any profile you did not create, then verify that no remaining profile allows PHP or script file uploads. Then check the profile order, so no hidden profile sits above your real ones.
Search for suspicious files
Scan /images, /media, /tmp, /cache and any custom upload directory and remove the PHP files that should not be there.
Run a server-side malware scan
Tools like ImunifyAV or ClamAV scan the actual files on your hosting account and not just the Joomla database and a Joomla admin extension scan alone is not sufficient.
Change all passwords
If there is any sign of compromise rotate the Joomla administrator passwords, your hosting control panel password, the FTP and SFTP credentials and the database passwords.
Restore from backup if needed
If you find malicious files the safest resolution is restoring from a clean backup taken before the attack reached your site.
Hardening Steps to Take After Cleanup
Once the site is clean and patched, reduce the risk of future incidents.
- Restrict the file upload extensions in JCE profiles to only what each user group actually needs.
- Enable two-factor authentication for all administrator accounts.
- Remove Joomla extensions that are unused or no longer maintained.
The One Thing Most Site Owners Miss
Updating JCE is the right move and it is not enough on its own. If your site was running a vulnerable version before June 3, 2026 an attacker may have already used that window and a web shell that was uploaded before the patch is still sitting on your server because it does not disappear when you update the extension.
A clean-looking front end is not confirmation that the site is clean, so check it.
Need the cleanup done for you?
IDL Web Inc handles malware cleanup, Joomla maintenance and support and starts every engagement with a clear picture of what was found and what it will take to resolve it.
How IDL Web Inc Can Help
We have been maintaining and recovering Joomla sites for over ten years and we know what a clean site looks like and what a compromised one looks like because we have cleaned them.
Checking your site
We scan for rogue JCE profiles, web shells and backdoor files and if you manage a portfolio of Joomla sites we can verify them quickly, see our free audit.
Malware cleanup
We remove rogue profiles, obfuscated shells, added admin accounts and backdoors hidden in legitimate-looking files, see our malware cleanup service.
Hacked site rescue
If your Joomla website was already hit, we bring it back, see our Joomla hacked websites rescue.
Maintenance and security
We keep Joomla and every extension patched, monitored and backed up, see our Joomla maintenance and support plans.
Don't forget
Remember to back up your Joomla website before you touch anything and check the site after you update JCE.
If you suspect that your site was already hit, leave it to the Joomla security team at IDL Web Inc, ask for a FREE audit or a FREE quote and we will tell you what we find. IDL Web Inc is a Canadian company that serves businesses in Canada and the USA. Keep up with us to know more of Joomla news/fixes!
Schedule Consultation with An Expert
As a Canadian company, IDL Web Inc can check, clean and secure your Joomla website after the JCE Editor vulnerability, ask for a FREE audit or a FREE quote and we will tell you exactly what was found.
