XSS in Nextcloud Notes
CVE-2023-39955
Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Nextcloud Notes
- Nextcloud Security-Advisories — versions >= 4.4.0, < 4.8.0
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-6g88-37x7-4vw6 (Patch, Vendor Advisory)
- github.com/nextcloud/notes/pull/1031 (Patch)
- hackerone.com/reports/1924355 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-39955?
- CVE-2023-39955 is a low-severity vulnerability in Nextcloud Notes, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2023-08-10.
- How severe is CVE-2023-39955?
- Low severity. CVSS v3 base score is 3.5 out of 10.