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CVE-2021-41233— Missing authorization in Nextcloud text

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 Server存在安全漏洞，该漏洞由于Nextcloud Text应用程序（默认情况下与 Nextcloud Server 一起提供）存在问题，攻击者能够访问File Drop的文件夹名称。

CVSS 6.5 · Medium EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1155
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I. Basic Information for CVE-2021-41233

Vulnerability Information
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Vulnerability Title
Missing authorization in Nextcloud text
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud text is a collaborative document editing using Markdown built for the nextcloud server. Due to an issue with the Nextcloud Text application, which is by default shipped with Nextcloud Server, an attacker is able to access the folder names of "File Drop". For successful exploitation an attacker requires knowledge of the sharing link. It is recommended that users upgrade their Nextcloud Server to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the Nextcloud Text application in the application settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 信息泄露漏洞
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 Server存在安全漏洞，该漏洞由于Nextcloud Text应用程序（默认情况下与 Nextcloud Server 一起提供）存在问题，攻击者能够访问File Drop的文件夹名称。
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 < 20.0.14 -

II. Public POCs for CVE-2021-41233

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III. Intelligence Information for CVE-2021-41233

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Patches & Fixes for CVE-2021-41233 (1)

Vendor Advisories for CVE-2021-41233 (1)

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-862

V. Comments for CVE-2021-41233

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