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CVE-2021-21379— It's possible to execute anything with the rights of the author of a macro which uses the {{wikimacrocontent}} macro

Quick assessment

Affected
xwiki xwiki-platform
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.

Xwiki Platform是法国Xwiki公司的一套用于创建Web协作应用程序的Wiki平台。 XWiki Platform 存在注入漏洞，该漏洞源于wiki宏作者的权限执行内容，而不是以该wiki宏的调用者的权限执行内容。

CVSS 7.7 · High EPSS 0.48% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21379

Vulnerability Information
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Vulnerability Title
It's possible to execute anything with the rights of the author of a macro which uses the {{wikimacrocontent}} macro
Source: CVE Program / CVE List V5
Vulnerability Description
XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions of XWiki Platform, the `{{wikimacrocontent}}` executes the content with the rights of the wiki macro author instead of the caller of that wiki macro. This makes possible to inject scripts through it and they will be executed with the rights of the wiki macro (very often a user which has Programming rights). Fortunately, no such macro exists by default in XWiki Standard but one could have been created or installed with an extension. This vulnerability has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. There is no easy workaround other than disabling the affected macros. Inserting content in a safe way or knowing what is the user who called the wiki macro is not easy.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Xwiki Platform 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xwiki Platform是法国Xwiki公司的一套用于创建Web协作应用程序的Wiki平台。 XWiki Platform 存在注入漏洞，该漏洞源于wiki宏作者的权限执行内容，而不是以该wiki宏的调用者的权限执行内容。
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
xwiki xwiki-platform >= 11.4.0, < 11.10.11 -

II. Public POCs for CVE-2021-21379

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III. Intelligence Information for CVE-2021-21379

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Vendor Advisories for CVE-2021-21379 (1)

Other References for CVE-2021-21379 (1)

IV. Related Vulnerabilities

Same product: xwiki-platform
Same vendor: xwiki
Same weakness: CWE-281