6.4
CVE-2021-39221
- EPSS 0.28%
- Veröffentlicht 25.10.2021 19:15:09
- Zuletzt bearbeitet 21.11.2024 06:18:56
- Quelle security-advisories@github.com
- CVE-Watchlists
- Unerledigt
LoginXSS in Contacts
XSS in Contacts
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.
Mögliche Gegenmaßnahme
Contacts: Use a browser that has support for Content-Security-Policy. You can find a list of supported browsers on [caniuse.com](https://caniuse.com/contentsecuritypolicy). A notable exemption is Internet Explorer which does not support CSP properly.
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.28% | 0.512 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| nvd@nist.gov | 5.4 | 2.3 | 2.7 |
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
|
| nvd@nist.gov | 3.5 | 6.8 | 2.9 |
AV:N/AC:M/Au:S/C:N/I:P/A:N
|
| security-advisories@github.com | 6.4 | 1.2 | 5.2 |
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
|
CWE-434 Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.