Vulnerability Details : 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 category: Cross site scripting (XSS)
Products affected by CVE-2021-22878
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-22878
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 35 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-22878
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
3.5
|
LOW | AV:N/AC:M/Au:S/C:N/I:P/A:N |
6.8
|
2.9
|
NIST | |
4.8
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
1.7
|
2.7
|
NIST |
CWE ids for CVE-2021-22878
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by:
- nvd@nist.gov (Primary)
- support@hackerone.com (Secondary)
References for CVE-2021-22878
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
[SECURITY] Fedora 34 Update: nextcloud-20.0.10-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/nextcloud/server/pull/25234
Fix encoding issue with OC.Notification.show by nickvergessen · Pull Request #25234 · nextcloud/server · GitHubPatch;Third Party Advisory
-
https://hackerone.com/reports/896522
#896522 Reflected XSS when renaming a file with a vulnerable name which results in an errorExploit;Issue Tracking;Third Party Advisory
-
https://nextcloud.com/security/advisory/?id=NC-SA-2021-005
advisory – NextcloudVendor Advisory
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