CVE-2026-71573

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

We have discovered 1,821 live websites that are affected by CVE-2026-71573.

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Affected Software

Product  Joomla
Category Content Management System
Vulnerable Domains1,821 live websites (1.36% of Joomla install base)
Vulnerable Versions
  • from 4 through 5
  • from 5 through 5.4.7
  • from 6 through 6.1.3
Vulnerable Versions Count27 versions ( 21% of all versions)


Common Weakness Enumeration

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')



Details

  • Published - Aug 18, 2026
  • Updated - Aug 19, 2026

Credits

  • Agamemnon Fakas (finder)
  • caveeroo (finder)

Website Distribution by Country

Number of websites using CVE-2026-71573
United States180 websites


Germany511 websites
France188 websites
Switzerland122 websites
Netherlands111 websites
Russia106 websites
Italy89 websites
Austria58 websites
GB53 websites
Spain28 websites

Website Distribution by TLD

Number of websites using CVE-2026-71573
.de440 websites
.com268 websites
.ch111 websites
.fr105 websites
.nl100 websites
.ru91 websites
.org87 websites
.it59 websites
.at57 websites
.net57 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-71573

Top websites that are affected by CVE-2026-71573. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
******.fr Canada**,***
************.ru Russia**,***
******.**.il Israel**,***
**.******.org United States**,***
**************.com France***,***
*****************.eu Germany***,***
********.org Italy***,***
********.de Germany***,***
****************.at Austria***,***
*********.de Germany***,***
See full domain list

FAQ

CVE-2026-71573 is Improper Neutralization of CRLF Sequences ('CRLF Injection') in Joomla
A total of 1,821 websites have been identified as vulnerable to CVE-2026-71573, based on global website indexing conducted by WebTechSurvey.
The Joomla is affected by the CVE-2026-71573 vulnerability.
Joomla versions up to 6.1.3 are vulnerable to CVE-2026-71573.
CVE-2026-71573 is resolved in version 6.1.3 of Joomla.