CVE-2021-39222
The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability.
Does this matter?
Lower severity and a low EPSS score (1.10%). Track it; it rarely justifies an emergency change on its own.
Description
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application 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 Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.10% probability · 64th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79, CWE-434
- Affected
- nextcloud/talk
- Source
- security-advisories@github.com
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5gThird Party Advisory
- https://github.com/nextcloud/spreed/pull/542Third Party Advisory
- https://hackerone.com/reports/1135481Permissions Required, Third Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5gThird Party Advisory
- https://github.com/nextcloud/spreed/pull/542Third Party Advisory
- https://hackerone.com/reports/1135481Permissions Required, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.