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CVE-2022-39338— Stored cross site scripting (XSS) vulnerability via Authorization Endpoint in user_oidc

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 user_oidc 1.2.1之前版本存在输入验证错误漏洞，该漏洞源于端点应用了限制性的CSP，这可能导致存储型跨站脚本。

CVSS 3.5 · Low EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell
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I. Basic Information for CVE-2022-39338

Vulnerability Information
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Vulnerability Title
Stored cross site scripting (XSS) vulnerability via Authorization Endpoint in user_oidc
Source: CVE Program / CVE List V5
Vulnerability Description
user_oidc is an OpenID Connect user backend for Nextcloud. Versions prior to 1.2.1 did not properly validate discovery urls which may lead to a stored cross site scripting attack vector. The impact is limited due to the restrictive CSP that is applied on this endpoint. Additionally this vulnerability has only been shown to be exploitable in the Safari web browser. This issue has been addressed in version 1.2.1. Users are advised to upgrade. Users unable to upgrade should urge their users to avoid using the Safari web browser.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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 user_oidc 1.2.1之前版本存在输入验证错误漏洞，该漏洞源于端点应用了限制性的CSP，这可能导致存储型跨站脚本。
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 < 1.2.1 -

II. Public POCs for CVE-2022-39338

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III. Intelligence Information for CVE-2022-39338

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Patches & Fixes for CVE-2022-39338 (1)

Vendor Advisories for CVE-2022-39338 (1)

Other References for CVE-2022-39338 (1)

Same Patch Batch · nextcloud · 2022-11-25 · 8 CVEs total

CVE-2022-39331 4.6 MEDIUM Cross-site Scripting (XSS) in Nexcloud Desktop Client
CVE-2022-39332 4.6 MEDIUM Cross-site scripting (XSS) in Nextcloud Desktop Client
CVE-2022-39333 4.6 MEDIUM Cross-site scripting (XSS) in Nextcloud Desktop Client
CVE-2022-39339 4.3 MEDIUM Cleartext Transmission of Sensitive Information in user_oidc
CVE-2022-39334 3.9 LOW nextcloudcmd incorrectly trusts bad TLS certificates
CVE-2022-39346 3.5 LOW Missing length validation of user displayname in nextcloud server
CVE-2022-41926 3.3 LOW Nextcloud Talk Android broadcast incorrect permission handling

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-20

V. Comments for CVE-2022-39338

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