XSS in Nextcloud Circles
CVE-2021-32782
Nextcloud Circles is an open source social network built for the nextcloud ecosystem. In affected versions the Nextcloud Circles application is vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Circles application is upgraded to 0.21.3, 0.20.10 or 0.19.14 to resolve this issue. As a workaround users may use a browser that has support for Content-Security-Policy. A notable exemption is Internet Explorer which does not support CSP properly.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Nextcloud Circles
- Nextcloud Security-Advisories — versions < 0.19.1, >= 0.20.0, < 0.20.10, >= 0.21.0, < 0.21.3
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-hgpq-28gj-jrj9 (Patch, Third Party Advisory)
- github.com/nextcloud/circles/commit/dbb97a83ccb342c839a54f088aa19b8ba6844b0e (Patch, Third Party Advisory)
- hackerone.com/reports/1217606 (Permissions Required, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32782?
- CVE-2021-32782 is a medium-severity vulnerability in Nextcloud Circles, classified under Cross-site Scripting. CVSS score: 5.8/10. Published 2021-09-07.
- How severe is CVE-2021-32782?
- Medium severity. CVSS v3 base score is 5.8 out of 10.