CVE-2023-26482
In affected versions a missing scope validation allowed users to create workflows which are designed to be only available for administrators.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.18% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- nextcloud/nextcloud server
- Source
- security-advisories@github.com
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpjVendor Advisory
- https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h3c9-cmh8-7qpjVendor Advisory
- https://github.com/nextcloud/server/commit/5a06b50b10cc9278bbe68bbf897a0c4aeb0c4e60Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.