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CVE-2023-26482— Scope of workflow operations is not validated in nextcloud server

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存在操作系统命令注入漏洞，该漏洞源于未验证工作流的操作范围，导致存在RCE。受影响的产品和版本：Nextcloud server 24.0.10之前的24.0.x版本，25.0.4之前的25.0.x版本。

CVSS 9.1 · Critical EPSS 4.18% · P91

Public Exploits 1

Metasploit · 1 nextcloud_workflows_rce.rb [exploit]
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I. Basic Information for CVE-2023-26482

Vulnerability Information
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Vulnerability Title
Scope of workflow operations is not validated in nextcloud server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud server is an open source home cloud implementation. In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators. Some workflows are designed to be RCE by invoking defined scripts, in order to generate PDFs, invoking webhooks or running scripts on the server. Due to this combination depending on the available apps the issue can result in a RCE at the end. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should disable app `workflow_scripts` and `workflow_pdf_converter` as a mitigation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 操作系统命令注入漏洞
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存在操作系统命令注入漏洞，该漏洞源于未验证工作流的操作范围，导致存在RCE。受影响的产品和版本：Nextcloud server 24.0.10之前的24.0.x版本，25.0.4之前的25.0.x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 < 24.0.10 -

II. Public POCs for CVE-2023-26482

# POC Description Source Link Shenlong Link
1 None https://github.com/ISabbiI/PoC---CVE-2023-26482-RCE-LAB-Nextcloud POC Details
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III. Intelligence Information for CVE-2023-26482

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Patches & Fixes for CVE-2023-26482 (1)

Vendor Advisories for CVE-2023-26482 (1)

Same Patch Batch · nextcloud · 2023-03-30 · 7 CVEs total

CVE-2023-28644 5.7 MEDIUM Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server
CVE-2023-28643 5.5 MEDIUM Potential share collision for recipients when caching is enabled in nextcloud server
CVE-2023-28646 4.4 MEDIUM App lockout in nextcloud Android app can be bypassed via thirdparty apps
CVE-2023-28647 4.4 MEDIUM App pin of the iOS app can be bypassed in Nextcloud iOS
CVE-2023-28835 3.5 LOW Insecure randomness for default password in nextcloud
CVE-2023-28833 2.4 LOW Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud s

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-78

V. Comments for CVE-2023-26482

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