XSS in Nextcloud Server
CVE-2021-22878
Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.011 (61.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Nextcloud Nextcloud_server
- Fedoraproject Fedora — versions 34
- N/a Nextcloud Server — versions Fixed in 20.0.6
Weakness classification (CWE)
References
- support@hackerone.com (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- support@hackerone.com (x_refsource_MISC, Vendor Advisory)
- support@hackerone.com (Patch, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-22878?
- CVE-2021-22878 is a medium-severity vulnerability in Nextcloud Server, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-03-03.
- How severe is CVE-2021-22878?
- Medium severity. CVSS v3 base score is 4.8 out of 10.