Skip to main content
mySites.guru
Free Audit
CriticalPHP2Shell is fixed, but a researcher now claims six more unpatched PHP flaws. Nothing to do today, but PHP is not out of the woodsWhat to prepare

Astroid Framework security vulnerabilities

mySites.guru tracks 2 vulnerabilities in Astroid Framework (astroid), covering 1 CVE. Every connected Joomla site is checked against them on each audit.

Is my site affected?

Your site is affected if it runs Astroid Framework in any of these ranges:

  • before 3.5.0
  • from 2.0.0 up to and including 3.3.10
Latest safe version
3.5.0 or later. No rule we check matches that release or any newer one.
What to do
Update Astroid Framework to 3.5.0 or later from the vendor, then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
Check whether your sites are affected

Every Astroid Framework vulnerability we track

Newest first. CVSS is the score published in each CVE record, where it has one; the severity column is the rating our check uses.

CVEAffected versionsFixed inSeverityAdded
CVE-2026-21628CVSS 10.0from 2.0.0 up to and including 3.3.10after 3.3.10Critical2026-03-05
No CVE idbefore 3.5.03.5.0Unrated-

What we check for

CriticalCVE-2026-216282026-03-05

Astroid Framework (astroid) 2.0.0 to 3.3.10 - Unauthenticated Arbitrary File Upload (RCE)

Astroid Framework by TemPlaza, versions 2.0.0 through 3.3.10, exposes an improperly secured file management feature on its AJAX endpoint. An unauthenticated attacker can upload dangerous file types, leading to remote code execution on the server. Astroid is a template framework, so the vulnerable code is present on every site whose template is built on it, regardless of which template is active. Fixed in 3.3.11, which the vendor released on 5 March 2026 with the note "Fixing security vulnerabilities at the AJAX endpoint". Update the Astroid Framework plugin to 3.3.11 or later (current release is 3.4.2). There is no configuration-level mitigation: the endpoint is reachable without a login.

Affected versions: ≥ 2.0.0 and ≤ 3.3.10

Full advisory: github.com

Astroid Framework (astroid) below 3.5.0 - Authenticated HTML Injection and Security-Attribute Override

Astroid Framework versions before 3.5.0 have two hardening issues fixed in the 3.5.0 release (28 Sep 2026), neither of which has been assigned a CVE by the vendor: (1) the Form Builder element output its configured submit-button text without escaping, allowing a user with backend access to the widget/page builder to inject arbitrary HTML into the rendered button; (2) the Button element's custom-attributes feature only blocked attribute names starting with "on" (blocking onclick etc.) but otherwise let any attribute through, so a backend widget-builder user could override the button's own href, id, class, target, rel or style attributes (e.g. redirecting the link or defeating rel=noopener on target=_blank links). Both require an already-authenticated backend user with access to edit the Astroid widget/page builder - not exploitable by anonymous or unauthenticated visitors - so severity is Low. Update to 3.5.0 or later.

Affected versions: < 3.5.0

Full advisory: github.com

Timeline

  1. 5 March 2026Check added for CVE-2026-21628 (from 2.0.0 up to and including 3.3.10)
  2. 5 March 2026CVE-2026-21628 record published
  3. 5 March 2026We published: Astroid Framework Vulnerability - What Happened and How to Check Your Joomla Site

What we have written about Astroid Framework

Astroid Framework Vulnerability - What Happened and How to Check Your Joomla Site

Astroid Framework Vulnerability - What Happened and How to Check Your Joomla Site

CVE-2026-21628 (CVSS 10.0) - Astroid Framework for Joomla had a critical auth bypass letting attackers upload backdoors. What happened and what to do.

References

Each CVE page above links its official cve.org record and its NVD entry.

Astroid Framework vulnerability questions

Which versions of Astroid Framework are vulnerable?
mySites.guru tracks 2 vulnerabilities in Astroid Framework (astroid). A site is affected if its installed version is in any of these ranges: before 3.5.0; from 2.0.0 up to and including 3.3.10.
What is the latest safe version of Astroid Framework?
3.5.0. Every vulnerability tracked here is fixed by 3.5.0, and no rule we check matches that release or any later one.
How do I check which version of Astroid Framework my Joomla site runs?
The installed version is listed on the Joomla administrator's Extensions: Manage screen; search it for astroid. mySites.guru reads the installed version on every audit of a connected site and checks it against these rules.

Running Astroid Framework 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.

CVE identifiers: CVE-2026-21628. Rules current as of 25 October 2026.