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CVE-2021-21358— Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form

Quick assessment

Affected
TYPO3 TYPO3.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.

TYPO3是瑞士TYPO3（Typo3）协会的一套免费开源的内容管理系统(框架)(CMS/CMF)。 TYPO3 存在跨站脚本漏洞，该漏洞源于表单设计器后端模块中对用户提供的数据的处理不足。

CVSS 5.4 · Medium EPSS 0.87% · P58

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2021-21358

Vulnerability Information
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Vulnerability Title
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form
Source: CVE Program / CVE List V5
Vulnerability Description
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3是瑞士TYPO3（Typo3）协会的一套免费开源的内容管理系统(框架)(CMS/CMF)。 TYPO3 存在跨站脚本漏洞，该漏洞源于表单设计器后端模块中对用户提供的数据的处理不足。
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
TYPO3 TYPO3.CMS >= 10.2.0, <= 10.4.13 -

II. Public POCs for CVE-2021-21358

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III. Intelligence Information for CVE-2021-21358

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Vendor Advisories for CVE-2021-21358 (1)

Other References for CVE-2021-21358 (2)

Same Patch Batch · TYPO3 · 2021-03-23 · 8 CVEs total

CVE-2021-21355 8.6 HIGH Unrestricted File Upload in Form Framework
CVE-2021-21357 8.3 HIGH Broken Access Control in Form Framework
CVE-2021-21339 5.9 MEDIUM Cleartext storage of session identifier
CVE-2021-21359 5.9 MEDIUM Denial of Service in Page Error Handling
CVE-2021-21340 5.4 MEDIUM Cross-Site Scripting in Content Preview
CVE-2021-21370 5.4 MEDIUM Cross-Site Scripting in Content Preview (CType menu)
CVE-2021-21338 4.7 MEDIUM Open Redirection in Login Handling

IV. Related Vulnerabilities

Same product: TYPO3.CMS
Same vendor: TYPO3
Same weakness: CWE-79

V. Comments for CVE-2021-21358

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