Paper/Archive/CVE-2023-26482

CVE-2023-26482

nextcloud security-advisories — Scope of workflow operations is not validated in nextcloud server

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 90.9.909 × 2018.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

security-advisories< 24.0.10–CNA

security-advisories>= 25.0.0, < 25.0.4–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpj refgithub.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60