CVE-2023-26482

Scope of workflow operations is not validated in nextcloud server

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.

Affected

nextcloud · security-advisories

CVSS v3.1 NVD

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

CVSS v3.1 GITHUB

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, 91st percentile

Published

2023-03-30

Updated

2025-02-11

Proof-of-concept exploits (1)

• ISabbiI/PoC---CVE-2023-26482-RCE-LAB-Nextcloud0★ · 2026-02-14

Metasploit modules (1)

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

Security advisories

• nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj
• nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60

References

• CVE Record
• NVD entry

Related

• CVE-2021-41773