CVE-2021-22878
MEDIUMCVSS 4.8/10EPSS 1.06%
Last modified
CVE-2021-22878 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.. EPSS estimates a 1.06% chance of exploitation in the next 30 days.
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`.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 20.0.6 |
| Fedoraproject | Fedora | 34 |
References
- https://github.com/nextcloud/server/pull/25234Patch, Third Party Advisory
- https://hackerone.com/reports/896522Exploit, Issue Tracking, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-005Vendor Advisory
- https://github.com/nextcloud/server/pull/25234Patch, Third Party Advisory
- https://hackerone.com/reports/896522Exploit, Issue Tracking, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-005Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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`.
How severe is CVE-2021-22878?
CVE-2021-22878 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22878?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-22878?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST