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CVE-2026-48907CriticalCVSS 10.0CVE published 5 June 2026Added to mySites.guru 8 June 2026

JCE (com_jce) below 2.9.99.6 - Unauthenticated Arbitrary File Upload (RCE) and Directory Traversal

JCE versions before 2.9.99.6 are affected by critical security issues, including an unauthenticated arbitrary file upload via editor profile upload that can lead to remote code execution and full server compromise, an authenticated authorisation bypass where a user could reach an editor profile they were not assigned to, and a directory traversal that listed folder contents outside the configured directory. Both JCE Core and JCE Pro are affected on Joomla 3, 4, 5 and 6. Update to 2.9.99.6 or later via the Joomla Update Manager.

Is my site affected?

Affected
JCE from 2.7.0 up to but not including 2.9.99.6
Fixed in
2.9.99.6
What to do
Update JCE to 2.9.99.6 for this flaw, or to 2.9.99.10 or later, which no rule we check matches.
Check whether your sites are affected

How CVE-2026-48907 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

10.0 Critical

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/U:Red

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:N Attack requirements
None. Works against any affected install
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
VA:H Availability
High. The site can be taken down

What it does beyond the site

SC:H Confidentiality
High. Data on other systems can be read
SI:H Integrity
High. Other systems can be altered
SA:H Availability
High. Other systems can be taken down

Timeline

  1. 5 June 2026CVE-2026-48907 record published by its CNA
  2. 8 June 2026mySites.guru check added for JCE (from 2.7.0 up to but not including 2.9.99.6)
  3. 8 June 2026We published: JCE Pro 2.9.99.6 Is a Hardening Release After a Full Audit of Joomla's Most-Installed Editor

Rule details

Our disclosure post

JCE Pro 2.9.99.6 Is a Hardening Release After a Full Audit of Joomla's Most-Installed Editor

JCE Pro 2.9.99.6 Is a Hardening Release After a Full Audit of Joomla's Most-Installed Editor

JCE Pro 2.9.99.6 follows a four-day security audit of the editor, narrowing entry points and hardening input validation. Recommended for every JCE site.

Other vulnerabilities in JCE

Updating for CVE-2026-48907 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

JCE

Latest safe version: 2.9.99.10

References

CVE-2026-48907 questions

Which versions are affected by CVE-2026-48907?
CVE-2026-48907 affects JCE from 2.7.0 up to but not including 2.9.99.6. The fix is in 2.9.99.6.
How do I fix CVE-2026-48907?
Update JCE to 2.9.99.6 for this flaw, or to 2.9.99.10 or later, which no rule we check matches. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-48907?
Joomla CNA scores it 10.0 (Critical) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

Running an affected version on a site you manage?

A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, fix.mysites.guru is a single fixed fee per incident, usually resolved the same day.

This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 5 October 2026.