CVE-2021-22878

MediumCVSS 4.8/10Last modified Jun 17, 2026

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 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
n/a	Nextcloud Server	Fixed in 20.0.6

References

https://github.com/nextcloud/server/pull/25234Patch, Third Party Advisory
https://hackerone.com/reports/896522Exploit, Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
https://nextcloud.com/security/advisory/?id=NC-SA-2021-005Vendor Advisory

Timeline

Published: Mar 3, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-228798.8Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs, allowing a malicious serve CVE-2021-22888.1Vulnerability in the Oracle Bills of Material product of Oracle E-Business Suite (component: Bill Issues). Supported versions that are affec CVE-2021-228807.5The PostgreSQL adapter in Active Record before 6.1.2.1, 6.0.3.5, 5.2.4.5 suffers from a regular expression denial of service (REDoS) vulnera CVE-2021-228816.1The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Hos CVE-2021-228827.5UniFi Protect before v1.17.1 allows an attacker to use spoofed cameras to perform a denial-of-service attack that may cause the UniFi Protec CVE-2021-228837.5Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a denial of service attack when too many connection attempts with an CVE-2021-228847.5Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to DNS rebinding attacks as the whitelist includes “localhost6”. When “l CVE-2021-228857.5A possible information disclosure / unintended method execution vulnerability in Action Pack >= 2.0.0 when using the `redirect_to` or `polym CVE-2021-228866.1Rocket.Chat before 3.11, 3.10.5, 3.9.7, 3.8.8 is vulnerable to persistent cross-site scripting (XSS) using nested markdown tags allowing a r CVE-2021-228872.3A vulnerability in the BIOS of Pulse Secure (PSA-Series Hardware) models PSA5000 and PSA7000 could allow an attacker to compromise BIOS firm CVE-2021-228886.1Revive Adserver before v5.2.0 is vulnerable to a reflected XSS vulnerability in the `status` parameter of campaign-zone-zones.php. An attack CVE-2021-228896.1Revive Adserver before v5.2.0 is vulnerable to a reflected XSS vulnerability in the `statsBreakdown` parameter of stats.php (and possibly ot