Vulnerability · Published Mar 3, 2021 · Assigned by hackerone
CVE-2021-22878
Medium 4.8
In plain English
A medium-severity cross-site scripting in Nextcloud Server. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).
Severity (CVSS NVD)4.8Medium
Exploit odds (30 days)1.1%top 35.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Nextcloud Server | Fixed in 20.0.6 |
Weakness: CWE-79
References
- https://hackerone.com/reports/896522 x_refsource_MISC
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-005 x_refsource_MISC
- https://github.com/nextcloud/server/pull/25234 x_refsource_MISC
- FEDORA-2021-eac0e52f88 vendor-advisory, x_refsource_FEDORA