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CVE-2023-35928— Nextcloud user scoped external storage can be used to gather credentials of other users

Quick assessment

Affected
nextcloud security-advisories
Exploitation
Public or AI PoC available; prioritize validation
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，该漏洞源于允许攻击者访问其他用户的登录凭据并接管其帐户。

CVSS 8.5 · High EPSS 0.98% · P61
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I. Basic Information for CVE-2023-35928

Vulnerability Information
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Vulnerability Title
Nextcloud user scoped external storage can be used to gather credentials of other users
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2. Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不充分特权处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
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，该漏洞源于允许攻击者访问其他用户的登录凭据并接管其帐户。
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 Nextcloud Enterprise Server >= 19.0.0, < 19.0.13.9 -

II. Public POCs for CVE-2023-35928

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 13367 chars
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III. Intelligence Information for CVE-2023-35928

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Patches & Fixes for CVE-2023-35928 (1)

Vendor Advisories for CVE-2023-35928 (1)

Other References for CVE-2023-35928 (1)

Same Patch Batch · nextcloud · 2023-06-23 · 5 CVEs total

CVE-2023-35172 8.7 HIGH Nextcloud Server password reset endpoint is not brute force protected
CVE-2023-35927 7.6 HIGH Nextcloud system addressbooks can be modified by malicious trusted server
CVE-2023-35173 5.7 MEDIUM End-to-End encrypted file-drops can be made inaccessible
CVE-2023-35171 4.1 MEDIUM Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-274

V. Comments for CVE-2023-35928

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