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CriticalA PHP security release fixes two CVSS 9.2 flaws, and PHP 8.1 and older get no patchWhat it means for your site

JCTables security vulnerabilities

mySites.guru tracks 1 vulnerability in JCTables (com_jctables), covering 1 CVE. Every connected Joomla site is checked against it on each audit.

Is my site affected?

Your site is affected if it runs JCTables in this range:

  • before 1.21.1
Latest safe version
1.21.1 or later. No rule we check matches that release or any newer one.
What to do
Update JCTables to 1.21.1 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 JCTables 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-2026-76570CVSS 10.0before 1.21.11.21.1Critical2026-09-30

What we check for

CriticalCVE-2026-765702026-09-30

JCTables (com_jctables) below 1.21.1 - Unauthenticated SQL Injection (database read and write, leading to RCE)

JCTables by JoomCode before 1.21.1 exposes a front-end CRUD controller (index.php?option=com_jctables&task=...) that performs no Joomla token validation and no authentication check on any task. Table names, column names and values are taken straight from the request and concatenated into SQL, and the escaping helper treats any quote-wrapped value as already escaped. An anonymous visitor can read any table in the Joomla database (including the users table) and write to any row, which is enough to take over an administrator account and from there install code on the site. No login or user interaction is needed (CVSS 4.0 10.0 Critical). Update JCTables to 1.21.1 or later, which adds token checks to the write tasks, always quotes values, and limits reads to administrator-configured tables. If you cannot update straight away, disable or uninstall the component until you can, and review administrator accounts for changes.

Affected versions: < 1.21.1

Full advisory: our disclosure post

Timeline

  1. 30 September 2026Check added for CVE-2026-76570 (before 1.21.1)
  2. 30 September 2026CVE-2026-76570 record published
  3. 30 September 2026We published: JCTables for Joomla: Unauthenticated SQL Injection Fixed in 1.21.1

What we have written about JCTables

JCTables for Joomla: Unauthenticated SQL Injection Fixed in 1.21.1

JCTables for Joomla: Unauthenticated SQL Injection Fixed in 1.21.1

CVE-2026-76570 lets anyone read and rewrite a Joomla database through the JCTables extension without logging in. Scored 10.0 Critical, fixed in 1.21.1.

References

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

JCTables vulnerability questions

Which versions of JCTables are vulnerable?
mySites.guru tracks one vulnerability in JCTables (com_jctables). A site is affected if its installed version is in this range: before 1.21.1.
What is the latest safe version of JCTables?
1.21.1. Every vulnerability tracked here is fixed by 1.21.1, and no rule we check matches that release or any later one.
How do I check which version of JCTables my Joomla site runs?
The installed version is listed on the Joomla administrator's Extensions: Manage screen; search it for com_jctables. mySites.guru reads the installed version on every audit of a connected site and checks it against this rule.

Running JCTables 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-2026-76570. Rules current as of 22 October 2026.