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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
CVE-2026-76570CriticalCVSS 10.0CVE published 30 September 2026Added to mySites.guru 30 September 2026

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.

Is my site affected?

Affected
JCTables before 1.21.1
Fixed in
1.21.1
What to do
Update JCTables to 1.21.1 or later.
Check whether your sites are affected

How CVE-2026-76570 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. 30 September 2026CVE-2026-76570 record published by its CNA
  2. 30 September 2026mySites.guru check added for JCTables (before 1.21.1)
  3. 30 September 2026We published: JCTables for Joomla: Unauthenticated SQL Injection Fixed in 1.21.1

Rule details

Our disclosure post

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.

Other vulnerabilities in JCTables

Updating for CVE-2026-76570 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

JCTables

Latest safe version: 1.21.1

References

CVE-2026-76570 questions

Which versions are affected by CVE-2026-76570?
CVE-2026-76570 affects JCTables before 1.21.1. The fix is in 1.21.1.
How do I fix CVE-2026-76570?
Update JCTables to 1.21.1 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-76570?
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 22 October 2026.