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)
EPSS: 0.008 (54.0th percentile) — read the EPSS interpretation.
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.
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
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, Third Party Advisory, x_refsource_MISC)
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.