CVE-2021-26038— [20210704] - Core - Privilege escalation through com_installer
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!是一套使用在Joomla!内容管理系统中的论坛组件。 Joomla! CMS 2.5.0 - 3.9.27存在代码问题漏洞，该漏洞源于com_installer 中的安装操作缺少对超级用户所需的硬编码 ACL 检查。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-26038
Vulnerability Information
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Vulnerability Title
[20210704] - Core - Privilege escalation through com_installer
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Joomla! 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joomla!是一套使用在Joomla!内容管理系统中的论坛组件。 Joomla! CMS 2.5.0 - 3.9.27存在代码问题漏洞，该漏洞源于com_installer 中的安装操作缺少对超级用户所需的硬编码 ACL 检查。
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 | 2.5.0-3.9.27 | - |
|
II. Public POCs for CVE-2021-26038
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-26038 (1)
-
https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html x_refsource_MISC vendor-advisory
Same Patch Batch · Joomla! Project · 2021-07-07 · 5 CVEs total
| CVE-2021-26035 | [20210701] - Core - XSS in JForm Rules field | |
| CVE-2021-26036 | [20210702] - Core - DoS through usergroup table manipulation | |
| CVE-2021-26037 | [20210703] - Core - Lack of enforced session termination | |
| CVE-2021-26039 | [20210705] - Core - XSS in com_media imagelist |
IV. Related Vulnerabilities
Same product: Joomla! CMS
-
CVE-2026-71573
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CVE-2026-72531
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CVE-2026-73336
Joomla! Core - [20260806] - XSS through schema.org outputs i -
CVE-2026-73372
Joomla! Core - [20260809] - Improper ACL checks when injecti -
CVE-2026-71572
Joomla! Core - [20260801] - Response header injection in dow
Same vendor: Joomla! Project
-
CVE-2026-71573
Joomla! Core - [20260802] - Improper CORS origin validation -
CVE-2026-72531
Joomla! Core - [20260804] - Improper ACL checks for custom f -
CVE-2026-73336
Joomla! Core - [20260806] - XSS through schema.org outputs i -
CVE-2026-73372
Joomla! Core - [20260809] - Improper ACL checks when injecti -
CVE-2026-71572
Joomla! Core - [20260801] - Response header injection in dow
V. Comments for CVE-2021-26038
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