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CVE-2023-35171— Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning

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存在输入验证错误漏洞，该漏洞源于允许攻击者将受害者从合法域重定向到攻击者站点的URL。受影响的产品和版本：NxtCloud Server 26.0.0及之前版本，NextCloud Enterprise Server 26.0.0及之前版本。

CVSS 4.1 · Medium EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment
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I. Basic Information for CVE-2023-35171

Vulnerability Information
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Vulnerability Title
Nextcloud Server vulnerable to open redirect on "Unsupported browser" warning
Source: CVE Program / CVE List V5
Vulnerability Description
NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. Starting in version 26.0.0 and prior to version 26.0.2, an attacker could supply a URL that redirects an unsuspecting victim from a legitimate domain to an attacker's site. Nextcloud Server and Nextcloud Enterprise Server 26.0.2 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:L/UI:R/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于允许攻击者将受害者从合法域重定向到攻击者站点的URL。受影响的产品和版本：NxtCloud Server 26.0.0及之前版本，NextCloud Enterprise Server 26.0.0及之前版本。
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 >= 26.0.0, < 26.0.2 -

II. Public POCs for CVE-2023-35171

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III. Intelligence Information for CVE-2023-35171

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Vendor Advisories for CVE-2023-35171 (1)

Other References for CVE-2023-35171 (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-2023-35928 8.5 HIGH Nextcloud user scoped external storage can be used to gather credentials of other users
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

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-601

V. Comments for CVE-2023-35171

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