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CVE-2021-43817— Reflected Cross-Site-Scripting vulnerability in Collabora Online

Quick assessment

Affected
CollaboraOnline online
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.

Collabora Online是 Collabora 的一个应用软件。一个强大的基于 LibreOffice 的在线办公室，支持所有主要的文档、电子表格和演示文件格式。 Collabora Online存在跨站脚本漏洞，该漏洞源于Collabora 中的iframe 缺少对用户提交的数据的转义和过滤。攻击者可以在创建 Collabora Online iframe 时将未转义的 HTML 注入变量，并在 Collabora Online iframe 的上下文中执行脚本。 这将允许访问存储在浏览器中的一

CVSS 8.2 · High EPSS 0.67% · P50
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I. Basic Information for CVE-2021-43817

Vulnerability Information
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Vulnerability Title
Reflected Cross-Site-Scripting vulnerability in Collabora Online
Source: CVE Program / CVE List V5
Vulnerability Description
Collabora Online is a collaborative online office suite based on LibreOffice technology. In affected versions a reflected XSS vulnerability was found in Collabora Online. An attacker could inject unescaped HTML into a variable as they created the Collabora Online iframe, and execute scripts inside the context of the Collabora Online iframe. This would give access to a small set of user settings stored in the browser, as well as the session's authentication token which was also passed in at iframe creation time. Users should upgrade to Collabora Online 6.4.16 or higher or Collabora Online 4.2.20 or higher. Collabora Online Development Edition 21.11 is not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/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
Collabora Online 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Collabora Online是 Collabora 的一个应用软件。一个强大的基于 LibreOffice 的在线办公室，支持所有主要的文档、电子表格和演示文件格式。 Collabora Online存在跨站脚本漏洞，该漏洞源于Collabora 中的iframe 缺少对用户提交的数据的转义和过滤。攻击者可以在创建 Collabora Online iframe 时将未转义的 HTML 注入变量，并在 Collabora Online iframe 的上下文中执行脚本。 这将允许访问存储在浏览器中的一
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
CollaboraOnline online >= 6.0.0, < 6.4.16 -

II. Public POCs for CVE-2021-43817

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III. Intelligence Information for CVE-2021-43817

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Vendor Advisories for CVE-2021-43817 (1)

IV. Related Vulnerabilities

Same product: online
Same vendor: CollaboraOnline
Same weakness: CWE-79

V. Comments for CVE-2021-43817

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