CVE-2023-26482

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.

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

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

EPSS

4.18% chance of exploitation in the next 30 days, 90th percentile

Published

2023-03-30

Updated

2025-02-11

Proof-of-concept exploits (1)

• ISabbiI/PoC---CVE-2023-26482-RCE-LAB-Nextcloud

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/unix/webapp/nextcloud_workflows_…

References

• CVE Record
• NVD entry

Related

• CVE-2021-41773
• CVE-2023-2648
• CVE-2023-26485
• CVE-2023-26475
• CVE-2023-26486
• CVE-2023-2647