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CVE-2026-58077 – Unauthenticated Stored XSS – 4Analytics Extension for Joomla (versions 1.0 throu…

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Summary

CVE-2026-58077 is an unauthenticated stored cross-site scripting (XSS) vulnerability in the 4Analytics extension for Joomla, developed by weeblr.com. The flaw resides in the extension’s Markdown-to-HTML conversion within its AI traffic analysis feature, where attacker-supplied content can be persisted and subsequently rendered as active JavaScript when viewed by a legitimate user. With a CVSS 4.0 score of 8.7 (High), the vendor confirms that a specially crafted unauthenticated request may result in website takeover under certain circumstances.

Technical details

  • Root cause: Insufficient sanitization during the Markdown-to-HTML conversion performed by the AI analysis feature allows attacker-controlled content — including malicious URLs — to be stored in the analytics data layer without adequate escaping or neutralization (CWE-79).
  • Trigger condition: An unauthenticated remote attacker sends a specially crafted HTTP request that injects a malicious payload into the extension’s data store. The payload executes when an authenticated user (e.g., a site administrator) views the AI analysis output in the Joomla backend.
  • Attack vector: Network-accessible with no authentication or elevated privileges required to inject the payload. Exploitation requires passive user interaction — a legitimate user must view the page rendering the stored content.
  • Impact: Successful exploitation can lead to session hijacking, credential theft, unauthorized administrative actions, and full website takeover under certain conditions. The CVSS 4.0 vector assigns High ratings to confidentiality, integrity, and availability of the vulnerable system (VC:H/VI:H/VA:H).

Affected software

  • 4Analytics extension for Joomla — all versions from 1.0 through 5.0.1 (all releases prior to 5.0.2)
  • Compatible with Joomla versions 3, 4, 5, and 6

Severity

CVSS 4.0 Base Score: 8.7 (High)
Vector: 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

Mitigation and recommended actions

  • Immediate: Upgrade 4Analytics to version 5.0.2 or later, released July 15, 2026 by weeblr.com. This version sets the Markdown-to-HTML conversion to safe mode, preventing attacker-controlled URLs from being rendered in the AI analysis output.
  • If immediate patching is not feasible: Restrict administrative dashboard access to trusted IP addresses via firewall or server-level controls, and limit or disable the AI analysis feature until the patch can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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Map your entire attack surface (continously)

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4

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6

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