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CVE-2023-48303— Nextcloud Server admins can change authentication details of user configured external storage

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 、 Nextcloud Enterprise Server 25.0.11之前、26.0.6之前和 27.1.0之前版本存在安全漏洞，该漏洞源于管理员可以更改用户配置的外部存储的身份验证详细信息。

CVSS 2.4 · Low EPSS 0.67% · P50

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2023-48303

Vulnerability Information
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Vulnerability Title
Nextcloud Server admins can change authentication details of user configured external storage
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and Nextcloud Enterprise Server, admins can change authentication details of user configured external storage. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.11, 26.0.6, and 27.1.0 contain a patch for this issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
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 、 Nextcloud Enterprise Server 25.0.11之前、26.0.6之前和 27.1.0之前版本存在安全漏洞，该漏洞源于管理员可以更改用户配置的外部存储的身份验证详细信息。
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 >= 25.0.0, < 25.0.11 -

II. Public POCs for CVE-2023-48303

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III. Intelligence Information for CVE-2023-48303

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Patches & Fixes for CVE-2023-48303 (1)

Vendor Advisories for CVE-2023-48303 (1)

Other References for CVE-2023-48303 (1)

Same Patch Batch · nextcloud · 2023-11-21 · 8 CVEs total

CVE-2023-48239 8.5 HIGH Nextcloud Server users can make external storage mount points inaccessible for other users
CVE-2023-48306 5.0 MEDIUM Nextcloud Server DNS pin middleware can be tricked into DNS rebinding allowing SSRF
CVE-2023-48304 4.3 MEDIUM Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
CVE-2023-48305 4.2 MEDIUM Nextcloud Server user_ldap app logs user passwords in the log file on level debug
CVE-2023-48307 3.5 LOW Nextcloud Mail app vulnerable to Server-Side Request Forgery
CVE-2023-48302 3.5 LOW Nextcloud Server vulnerable to Self XSS when pasting HTML into Text app with Ctrl+Shift+V
CVE-2023-48301 3.5 LOW Nextcloud Server HTML injection in search UI when selecting a circle with HTML in the disp

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2023-48303

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