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CVE-2026-49049HighCVSS 7.5CVE published 29 June 2026Added to mySites.guru 29 June 2026

Helix3 Template (shaper_helix3) below 3.1.2 - Unauthenticated File Write/Delete via com_ajax (RCE, CVE-2026-49049)

The Helix3 template framework's com_ajax plugin handler (plugins/ajax/helix3/helix3.php, onAjaxHelix3) performs a file write/delete reachable without authentication: no authorise() or session-token gate on a guest com_ajax request. Fixed in Helix3 3.1.1 (JoomShaper security release, 29 Jun 2026); the patched build closes multiple unauthenticated vectors in the handler, not only the reported actions. CVE pending (credited to Phil Taylor, Blue Flame Digital Solutions). Update to 3.1.1 or later. Affected 1.0-3.1.1 (CVE-2026-49049); fixed in Helix3 3.1.2.

Is my site affected?

Affected
Helix3 Template before 3.1.2
Fixed in
3.1.2
What to do
Update Helix3 Template to 3.1.2 or later.
Check whether your sites are affected

How CVE-2026-49049 is scored

The base metrics as CISA-ADP 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.

7.5 High

CVSS 3.1, scored by CISA-ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything
S:U Scope
Unchanged. Contained to the extension it is in

What it does

C:N Confidentiality
None. Nothing can be read
I:H Integrity
High. Data and files can be altered at will
A:N Availability
None. The site stays up

mySites.guru rates this Critical. Where our assessment and the published record differ, your sites are checked against ours.

Timeline

  1. 29 June 2026CVE-2026-49049 record published by its CNA
  2. 29 June 2026mySites.guru check added for Helix3 Template (before 3.1.2)

Rule details

Other vulnerabilities in Helix3 Template

Updating for CVE-2026-49049 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

Helix3 Template

Latest safe version: 3.1.2

References

CVE-2026-49049 questions

Which versions are affected by CVE-2026-49049?
CVE-2026-49049 affects Helix3 Template before 3.1.2. The fix is in 3.1.2.
How do I fix CVE-2026-49049?
Update Helix3 Template to 3.1.2 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-49049?
CISA-ADP scores it 7.5 (High) under CVSS 3.1. 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 5 October 2026.