Skip to main content
mySites.guru
Free Audit
J!Awards 2026mySites.guru is shortlisted for Your Favourite Tool in Your Joomla WorkflowVote by 11 OctoberHow to vote
CVE-2026-58148HighCVSS 8.7CVE published 17 July 2026Added to mySites.guru 17 July 2026

ChronoForms 8 (com_chronoforms8) below 8.0.53 - Unauthenticated Stored XSS

ChronoForms 8 (ChronoEngine) versions up to and including 8.0.52 contain an unauthenticated stored cross-site scripting flaw (CVE-2026-58148): an anonymous visitor can store markup that later executes in the browser of another user or an administrator viewing the page. Scored CVSS 4.0 8.7 (High) by the Joomla CNA. Reported by Italo Almeida (not by mySites.guru). Update to ChronoForms 8.0.53 or later. This rule covers the ChronoForms 8 line only (com_chronoforms8), which is where the 8.0.53 fix ships.

Is my site affected?

Affected
ChronoForms 8 before 8.0.53
Fixed in
8.0.53
What to do
Update ChronoForms 8 to 8.0.53 or later.
Check whether your sites are affected

How CVE-2026-58148 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.

8.7 High

CVSS 4.0, scored by Joomla CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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
AT:N Attack requirements
None. Works against any affected install
PR:N Privileges required
None. No account needed
UI:P User interaction
Passive. Someone has to visit a page

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:N Confidentiality
None. Other systems keep their data
SI:N Integrity
None. Other systems keep their integrity
SA:N Availability
None. Other systems stay up

Timeline

  1. 17 July 2026CVE-2026-58148 record published by its CNA
  2. 17 July 2026mySites.guru check added for ChronoForms 8 (before 8.0.53)
  3. 17 July 2026We published: We Are Not the Only Ones Auditing Joomla Extensions

Rule details

Our disclosure post

We Are Not the Only Ones Auditing Joomla Extensions

We Are Not the Only Ones Auditing Joomla Extensions

Two Joomla extension flaws went public via the Joomla CNA: a SQL injection in JoomCCK and a stored XSS in ChronoForms. Neither was ours. Update now.

Other vulnerabilities in ChronoForms 8

Updating for CVE-2026-58148 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

ChronoForms 8

Latest safe version: 8.0.53

References

CVE-2026-58148 questions

Which versions are affected by CVE-2026-58148?
CVE-2026-58148 affects ChronoForms 8 before 8.0.53. The fix is in 8.0.53.
How do I fix CVE-2026-58148?
Update ChronoForms 8 to 8.0.53 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-58148?
Joomla CNA scores it 8.7 (High) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and someone has to visit a page.

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 5 October 2026.