Bug 2024960 (CVE-2021-39222)

Summary:	CVE-2021-39222 nextcloud: Stored Cross-Site Scripting in Talk
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ce, james.hogarth
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2021-11-19 15:51:02 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2024962
Bug Blocks:

Description Pedro Sampaio 2021-11-19 15:18:16 UTC

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.

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5g
https://hackerone.com/reports/1135481
https://github.com/nextcloud/spreed/pull/542

Comment 1 Pedro Sampaio 2021-11-19 15:19:59 UTC

Created nextcloud tracking bugs for this issue:

Affects: fedora-all [bug 2024962]

Comment 2 Product Security DevOps Team 2021-11-19 15:51:01 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.