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CVE-2026-71573— Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2

Quick assessment

Affected
Joomla! Project Joomla! CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

joomla是joomla组织开源的一款内容管理系统。 joomla 4.0.0版本至5.4.7版本和6.0.0版本至6.1.2版本存在输入验证错误漏洞，该漏洞源于CORS来源验证不当，导致配置的CORS来源在CORS请求中无法被正确验证。

CVSS 6.9 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Joomla! Project Joomla! CMS 4.0.0-5.4.6 affected
6.0.0-6.1.2 affected
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I. Basic Information for CVE-2026-71573

Vulnerability Information
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Vulnerability Title
Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
joomla 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
joomla是joomla组织开源的一款内容管理系统。 joomla 4.0.0版本至5.4.7版本和6.0.0版本至6.1.2版本存在输入验证错误漏洞，该漏洞源于CORS来源验证不当，导致配置的CORS来源在CORS请求中无法被正确验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Joomla! Project Joomla! CMS 4.0.0-5.4.6 -

II. Public POCs for CVE-2026-71573

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III. Intelligence Information for CVE-2026-71573

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Vendor Advisories for CVE-2026-71573 (1)

Vendor Pages for CVE-2026-71573 (1)

Same Patch Batch · Joomla! Project · 2026-08-18 · 10 CVEs total

CVE-2026-73373 8.9 HIGH Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0
CVE-2026-71574 8.5 HIGH Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in J
CVE-2026-73337 8.2 HIGH Joomla! Core - [20260807] - MFA Authentication Bypass in Joomla 4.0.0-5.4.7 and 6.0.0-6.1.
CVE-2026-72531 5.1 MEDIUM Joomla! Core - [20260804] - Improper ACL checks for custom fields webservice endpoints in
CVE-2026-72532 5.1 MEDIUM Joomla! Core - [20260805] - Improper ACL checks for category webservice endpoints in Jooml
CVE-2026-73336 5.1 MEDIUM Joomla! Core - [20260806] - XSS through schema.org outputs in Joomla 5.1.0-5.4.7, 6.0.0-6.
CVE-2026-73372 5.1 MEDIUM Joomla! Core - [20260809] - Improper ACL checks when injection schema.org contact data in
CVE-2026-73371 5.1 MEDIUM Joomla! Core - [20260808] - Improper ACL checks for batch copy actions in Joomla 4.0.0-5.4
CVE-2026-71572 4.8 MEDIUM Joomla! Core - [20260801] - Response header injection in download views in Joomla 3.0.0-5.

IV. Related Vulnerabilities

Same product: Joomla! CMS
Same vendor: Joomla! Project
Same weakness: CWE-93

V. Comments for CVE-2026-71573

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