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CVE-2026-102785CriticalCVSS 10.0CVE published 22 October 2026Added to mySites.guru 21 October 2026

YOOtheme Pro (yootheme) 5.0.0 to 5.0.52 - Unauthenticated Remote Code Execution via Image Handler (Critical)

YOOtheme Pro 5.0.0 to 5.0.52 is affected by CVE-2026-102785, which YOOtheme describes in its changelog as an unauthenticated remote code execution via the image handler. The vulnerable code is the public image cache route that YOOtheme Pro uses to serve resized and cropped images, which is reachable by any visitor with no login. Fixed in YOOtheme Pro 5.0.53, released 21 October 2026. Comparing the 5.0.52 and 5.0.53 packages shows the fix: the image controller now only accepts a fixed allow-list of image operations (type, crop, resize, rotate, flip, thumbnail) instead of any method on the image object, and it now checks that the requested cache file name matches the one generated for the signed image URL, so a request can no longer choose where the generated file is written. YOOtheme Pro 4 and earlier are not affected, according to the vendor. The CVE is reserved but its record is not yet published, so no official CVSS score is available. There is no interim mitigation: take a backup and update every YOOtheme Pro 5 site to 5.0.53 or later through the Joomla Extensions manager or your YOOtheme account, then run a new snapshot to clear this alert. YOOtheme Pro installs as both a template and a system plugin, both reporting the element yootheme, so a site normally shows two rows for this; updating YOOtheme Pro updates both together.

Is my site affected?

Affected
YOOtheme Pro from 5.0.0 up to but not including 5.0.53
Fixed in
5.0.53
What to do
Update YOOtheme Pro to 5.0.53 or later.
Check whether your sites are affected

How CVE-2026-102785 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

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. 21 October 2026mySites.guru check added for YOOtheme Pro (from 5.0.0 up to but not including 5.0.53)
  2. 21 October 2026We published: YOOtheme Pro 5.0.53 Fixes an Unauthenticated RCE: Update Every Site Now
  3. 22 October 2026CVE-2026-102785 record published by its CNA

Rule details

Our disclosure post

YOOtheme Pro 5.0.53 Fixes an Unauthenticated RCE: Update Every Site Now

YOOtheme Pro 5.0.53 Fixes an Unauthenticated RCE: Update Every Site Now

YOOtheme Pro 5.0.53 fixes CVE-2026-102785, an unauthenticated remote code execution flaw in the image handler. Update every Pro 5 site now; Pro 4 is unaffected.

Other vulnerabilities in YOOtheme Pro

Updating for CVE-2026-102785 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

YOOtheme Pro

Latest safe version: 5.0.53

References

CVE-2026-102785 questions

Which versions are affected by CVE-2026-102785?
CVE-2026-102785 affects YOOtheme Pro from 5.0.0 up to but not including 5.0.53. The fix is in 5.0.53.
How do I fix CVE-2026-102785?
Update YOOtheme Pro to 5.0.53 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-102785?
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?

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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 11 November 2026.