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CVE-2026-58077HighCVSS 8.7CVE published 15 July 2026Added to mySites.guru 15 July 2026

4Analytics (com_foranalytics) below 5.0.2 - Unauthenticated Stored XSS (website takeover)

All versions of the Weeblr 4Analytics extension for Joomla up to and including 5.0.1 are affected by two critical unauthenticated stored XSS vulnerabilities, both rated High (CVSS 4.0 base 8.7 and 8.6) and both reported by the vendor. CVE-2026-58077: a specially crafted unauthenticated request stores malicious script that, under some circumstances, can result in a full website takeover. CVE-2026-57833: a second unauthenticated stored XSS reached through the AI analysis feature, where attacker-controlled content was rendered from Markdown to HTML without safe mode. No authentication and no account on the site are required to exploit either issue, so any site running an affected version is reachable by an anonymous attacker on the internet. The vendor released 5.0.2 on 15 July 2026 as an emergency security release covering both issues, and it runs on Joomla 3, 4, 5 and 6. Update to 4Analytics 5.0.2 or later immediately. If you cannot update straight away, unpublish the 4Analytics system plugin to stop the unauthenticated tracking endpoint from accepting requests. Note that the vendor is withholding technical details until roughly 22 July 2026 to give sites time to update, so expect exploitation attempts to follow that disclosure.

Is my site affected?

Affected
4Analytics before 5.0.2
Fixed in
5.0.2
What to do
Update 4Analytics to 5.0.2 or later.
Check whether your sites are affected

How CVE-2026-58077 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. 15 July 2026CVE-2026-58077 record published by its CNA
  2. 15 July 2026mySites.guru check added for 4Analytics (before 5.0.2)

Rule details

Other vulnerabilities in 4Analytics

Updating for CVE-2026-58077 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.

4Analytics

Latest safe version: 5.0.2

References

CVE-2026-58077 questions

Which versions are affected by CVE-2026-58077?
CVE-2026-58077 affects 4Analytics before 5.0.2. The fix is in 5.0.2.
How do I fix CVE-2026-58077?
Update 4Analytics to 5.0.2 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-58077?
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?

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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.