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CVE-2021-32782— Cross-Site Scripting in Nextcloud Circles

Quick assessment

Affected
nextcloud security-advisories
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.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Circles 中存在跨站脚本漏洞，该漏洞源于产品的Content-Security-Policy在某些浏览器中未能正确处理输入输入数据。攻击者可通过该漏洞执行客户端代码。

CVSS 5.8 · Medium EPSS 0.83% · P56
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I. Basic Information for CVE-2021-32782

Vulnerability Information
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Vulnerability Title
Cross-Site Scripting in Nextcloud Circles
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application is vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Circles application is upgraded to 0.21.3, 0.20.10 or 0.19.14 to resolve this issue. As a workaround users may use a browser that has support for Content-Security-Policy. A notable exemption is Internet Explorer which does not support CSP properly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/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
Nextcloud 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Circles 中存在跨站脚本漏洞，该漏洞源于产品的Content-Security-Policy在某些浏览器中未能正确处理输入输入数据。攻击者可通过该漏洞执行客户端代码。
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
nextcloud security-advisories < 0.19.1 -

II. Public POCs for CVE-2021-32782

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III. Intelligence Information for CVE-2021-32782

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Patches & Fixes for CVE-2021-32782 (1)

Vendor Advisories for CVE-2021-32782 (1)

Other References for CVE-2021-32782 (1)

Same Patch Batch · nextcloud · 2021-09-07 · 9 CVEs total

CVE-2021-32802 9.3 CRITICAL Preview generation used third-party library not suited for user-generated content in Nextc
CVE-2021-32800 8.1 HIGH Bypass of Two Factor Authentication in Nextcloud server
CVE-2021-37628 7.5 HIGH File Drop can be bypassed using Richdocuments app in nextcloud
CVE-2021-37630 6.5 MEDIUM Secret Circle can be joined without approval in Nextcloud Circles
CVE-2021-37631 6.5 MEDIUM Circle can be accessed by non-Circle members in Nextcloud Deck
CVE-2021-32801 5.5 MEDIUM Exceptions may have logged Encryption-at-Rest key content in Nextcloud server
CVE-2021-32766 5.3 MEDIUM Nextcloud Text app can disclose existence of folders in "File Drop" link share
CVE-2021-37629 5.3 MEDIUM Lack of ratelimit on Richdocuments OCS endpoint in nextcloud

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-79

V. Comments for CVE-2021-32782

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