RCE in Nextcloud Server
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.042 (90.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Nextcloud Nextcloud_server
- Nextcloud Security-advisories — versions < 24.0.10, >= 25.0.0, < 25.0.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-26482?
- CVE-2023-26482 is a critical-severity vulnerability in Nextcloud Server, classified under OS Command Injection. CVSS score: 9.0/10. Published 2023-03-30.
- How severe is CVE-2023-26482?
- Critical severity. CVSS v3 base score is 9.0 out of 10.
- Is CVE-2023-26482 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.