CVE-2021-22878: XSS
First published: Wed Mar 03 2021(Updated: )
Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nextcloud Nextcloud Server | <20.0.6 | |
| Fedoraproject Fedora | =34 |
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Reference Links
- https://github.com/nextcloud/server/pull/25234
- https://hackerone.com/reports/896522
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-005
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
Frequently Asked Questions
What is CVE-2021-22878?
CVE-2021-22878 is a vulnerability in Nextcloud Server prior to version 20.0.6 that allows for reflected cross-site scripting (XSS) attacks.
How does CVE-2021-22878 impact Nextcloud Server?
CVE-2021-22878 allows an attacker to execute malicious scripts in the victim's browser, potentially leading to unauthorized actions or data theft.
What is the severity of CVE-2021-22878?
CVE-2021-22878 has a severity rating of medium with a CVSS score of 4.8.
How can I fix CVE-2021-22878 in Nextcloud Server?
To fix CVE-2021-22878, it is recommended to update Nextcloud Server to version 20.0.6 or later.
Where can I find more information about CVE-2021-22878?
You can find more information about CVE-2021-22878 at the following references: [GitHub Pull Request](https://github.com/nextcloud/server/pull/25234) and [HackerOne report](https://hackerone.com/reports/896522).
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- agent/type
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- vendor/nextcloud
- canonical/nextcloud nextcloud server
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/34