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CVE-2026-73373— Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 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 1.0.0版本至5.4.7版本和6.0.0版本至6.1.2版本存在任意文件上传漏洞，该漏洞源于默认的危险文件列表未包含SHTML文件，导致不受限制地上传SHTML文件，在服务器执行这些文件时可能导致代码执行。

CVSS 8.9 · High EPSS 0.65% · P49

Affected Version Matrix 4

VendorProduct Version RangeStatus
Joomla! Project Joomla! CMS 1.0.0-5.4.6 affected
6.0.0-6.1.2 affected
Joomla! Project Joomla! Framework Filesystem package 1.0.0-3.3.0 affected
4.0.0-4.2.0 affected
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I. Basic Information for CVE-2026-73373

Vulnerability Information
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Vulnerability Title
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2
Source: CVE Program / CVE List V5
Vulnerability Description
Joomla! Core - [20260810] - Unrestricted uploads of SHTML files in Joomla 1.0.0-5.4.7, 6.0.0-6.1.2 - The default list of dangerous files did not include SHTML files. On servers that executed these files, that could lead to code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
joomla 任意文件上传漏洞
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 1.0.0版本至5.4.7版本和6.0.0版本至6.1.2版本存在任意文件上传漏洞，该漏洞源于默认的危险文件列表未包含SHTML文件，导致不受限制地上传SHTML文件，在服务器执行这些文件时可能导致代码执行。
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 1.0.0-5.4.6 -
Joomla! Project Joomla! Framework Filesystem package 1.0.0-3.3.0 -

II. Public POCs for CVE-2026-73373

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III. Intelligence Information for CVE-2026-73373

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Vendor Advisories for CVE-2026-73373 (1)

Vendor Pages for CVE-2026-73373 (1)

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

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-2026-71573 6.9 MEDIUM Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6
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-434

V. Comments for CVE-2026-73373

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