Cross-site scripting in Nextcloud Server
Priority LOW 24CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.
Why it matters now
EPSS 0.01059 64th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Nextcloud Server | Fixed in 20.0.6 | — | No fix listed | CNA |
- Nextcloud Server Vendor— Affected Fixed in 20.0.6 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | before 20.0.6 | Vulnerable | nextcloud |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 20.0.6 Vulnerable ·nextcloud
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Nextcloud Server — FEDORA-2021-eac0e52f88
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2021-05738 Improper access control in Nextcloud ServerPriority LOW 32
- TI-2020-06713 Nextcloud Server prior to 20.0.0 stores passwords in a recoverable format even when external storage is not configured.Priority LOW 30
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-22878
- 2026-10-03 Alias added: GHSA-3qm7-9jrc-h4gp
References
Sources
- CVE-2021-22878 · CVE Program
- CVE-2021-22878 · NVD
- FIRST EPSS
- GHSA-3qm7-9jrc-h4gp · GitHub Advisory Database · CC BY 4.0
- CVE-2021-22878 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences