CVE-2026-58077Network attack vector

Website takeover via unsafe Markdown conversion

Published Jul 15, 2026 · Updated Jul 15, 2026

Stored XSS in Weeblr 4Analytics 5.0.1 and earlier allows remote attackers to take over Joomla websites through crafted requests. The AI-analysis renderer converts Markdown containing an attacker URL to HTML without safe mode, allowing the stored URL to become executable page content. No authentication is needed to submit the URL, but passive interaction is required when a later visitor views the affected analysis, and only sites where AI analysis mentions that URL are exposed.

CVSS severity8.7
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Weeblr 4Analytics 5.0.1 and earlier allows remote attackers to take over Joomla websites through crafted requests. The AI-analysis renderer converts Markdown containing an attacker URL to HTML without safe mode, allowing the stored URL to become executable page content. No authentication is needed to submit the URL, but passive interaction is required when a later visitor views the affected analysis, and only sites where AI analysis mentions that URL are exposed.

The record

CVE
CVE-2026-58077
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Weeblr
Product
4Analytics
Classifications
CWE-79, CAPEC-18, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0-5.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Weeblr · 4Analyticsversion=1.0-5.0.1

Published CVSS scores

8.7Joomla CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-18XSS Targeting Non-Script Elements
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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