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

2023-03-3018:27:17

CWE-78

GitHub_M

www.cve.org

nextcloud

cve-2023-26482

workflow

validation

rce

upgrade

mitigation

security

9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

9.2 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

51.0%

JSON

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.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": "< 24.0.10",
        "status": "affected"
      },
      {
        "version": ">= 25.0.0, < 25.0.4",
        "status": "affected"
      }
    ]
  }
]