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CVE-2023-39955— Notes attachment render HTML in preview mode

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 Notes 4.4.0版本至4.8.0之前版本存在跨站脚本漏洞，该漏洞源于当使用HTML创建笔记文件时，内容会在预览中呈现，而不是提供下载的文件。

CVSS 3.5 · Low EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1562.008
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I. Basic Information for CVE-2023-39955

Vulnerability Information
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Vulnerability Title
Notes attachment render HTML in preview mode
Source: CVE Program / CVE List V5
Vulnerability Description
Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
Nextcloud Notes 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 Notes 4.4.0版本至4.8.0之前版本存在跨站脚本漏洞，该漏洞源于当使用HTML创建笔记文件时，内容会在预览中呈现，而不是提供下载的文件。
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 >= 4.4.0, < 4.8.0 -

II. Public POCs for CVE-2023-39955

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III. Intelligence Information for CVE-2023-39955

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Patches & Fixes for CVE-2023-39955 (1)

Vendor Advisories for CVE-2023-39955 (1)

Other References for CVE-2023-39955 (1)

Same Patch Batch · nextcloud · 2023-08-10 · 10 CVEs total

CVE-2023-39963 8.1 HIGH Missing password confirmation when creating app passwords
CVE-2023-39962 7.7 HIGH Users can delete external storage mount points
CVE-2023-39952 6.5 MEDIUM Advanced permissions not respected when copying entire group folders
CVE-2023-39958 5.8 MEDIUM Missing brute force protection on password reset token OAuth2 API controller
CVE-2023-39953 4.8 MEDIUM Issuer not verified from obtained token in user_oidc
CVE-2023-39954 3.8 LOW user_oidc app stores client secret unencrypted in database
CVE-2023-39959 3.5 LOW Existence of calendars and address books can be checked by unauthenticated users
CVE-2023-39961 3.5 LOW Text does not respect "Allow download" permissions
CVE-2023-39957 Path traversal allows tricking the Talk Android app into writing files into it's root dire

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-39955

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