XSS in Nextcloud Server
CVE-2023-48302
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.13, 26.0.8, and 27.1.3 contain a fix for this issue. As a workaround, disable app text.
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:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (45.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.0% 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 Server
- Nextcloud Security-Advisories — versions >= 25.0.0, < 25.0.13, >= 26.0.0, < 26.0.8, >= 27.0.0, < 27.1.3
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-p7g9-x25m-4h87 (Vendor Advisory)
- github.com/nextcloud/text/pull/4877 (Patch)
- hackerone.com/reports/2211561 (Permissions Required)
Frequently asked questions
- What is CVE-2023-48302?
- CVE-2023-48302 is a low-severity vulnerability in Nextcloud Server, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2023-11-21.
- How severe is CVE-2023-48302?
- Low severity. CVSS v3 base score is 3.5 out of 10.