XSS in Nextcloud Desktop
CVE-2023-23942
The Nextcloud Desktop Client is a tool to synchronize files from a Nextcloud Server with your computer. Versions prior to 3.6.3 are missing sanitisation on qml labels which are used for basic HTML elements such as `strong`, `em` and `head` lines in the UI of the desktop client. The lack of sanitisation may allow for javascript injection. It is recommended that the Nextcloud Desktop Client is upgraded to 3.6.3. There are no known workarounds for this issue.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Nextcloud Desktop
- Nextcloud Security-Advisories — versions < 3.6.3
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-64qc-vf6v-8xgg (Vendor Advisory)
- github.com/nextcloud/desktop/pull/5233 (Patch)
- hackerone.com/reports/1788598 (Permissions Required, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-23942?
- CVE-2023-23942 is a medium-severity vulnerability in Nextcloud Desktop, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-02-06.
- How severe is CVE-2023-23942?
- Medium severity. CVSS v3 base score is 5.4 out of 10.