CVE-2023-26482

Scope of workflow operations is not validated in nextcloud server

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-02-23 CVE Reserved
2023-03-30 CVE Published
2024-08-02 CVE Updated
2024-10-20 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60	2023-04-06

URL	Date	SRC
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj	2023-04-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 18.0.0 < 20.0.14.12 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 18.0.0 < 20.0.14.12"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 21.0.0 < 21.0.9.10 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 21.0.0 < 21.0.9.10"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 22.0.0 < 22.2.10.10 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 22.0.0 < 22.2.10.10"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 23.0.0 < 23.0.12.5 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 23.0.0 < 23.0.12.5"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.0 < 24.0.10 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.10"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.0 < 24.0.10 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.10"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.4 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.4"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.4 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.4"		enterprise		Affected