Vulnerability Details CVE-2021-39221
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 51.2%
CVSS Severity
CVSS v3 Score 6.4
CVSS v2 Score 3.5
References
Products affected by CVE-2021-39221
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cpe:2.3:a:nextcloud:contacts:2.0.0
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cpe:2.3:a:nextcloud:contacts:2.0.1
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cpe:2.3:a:nextcloud:contacts:2.1.0
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cpe:2.3:a:nextcloud:contacts:2.1.1
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cpe:2.3:a:nextcloud:contacts:2.1.2
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cpe:2.3:a:nextcloud:contacts:2.1.3
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cpe:2.3:a:nextcloud:contacts:2.1.4
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cpe:2.3:a:nextcloud:contacts:2.1.5
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cpe:2.3:a:nextcloud:contacts:2.1.6
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cpe:2.3:a:nextcloud:contacts:2.1.7
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cpe:2.3:a:nextcloud:contacts:2.1.8
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cpe:2.3:a:nextcloud:contacts:3.0.0
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cpe:2.3:a:nextcloud:contacts:3.0.1
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cpe:2.3:a:nextcloud:contacts:3.0.2
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cpe:2.3:a:nextcloud:contacts:3.0.3
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cpe:2.3:a:nextcloud:contacts:3.0.4
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cpe:2.3:a:nextcloud:contacts:3.0.5
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cpe:2.3:a:nextcloud:contacts:3.1.0
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cpe:2.3:a:nextcloud:contacts:3.1.1
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cpe:2.3:a:nextcloud:contacts:3.1.2
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cpe:2.3:a:nextcloud:contacts:3.1.3
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cpe:2.3:a:nextcloud:contacts:3.1.4
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cpe:2.3:a:nextcloud:contacts:3.1.5
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cpe:2.3:a:nextcloud:contacts:3.1.6
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cpe:2.3:a:nextcloud:contacts:3.1.7
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cpe:2.3:a:nextcloud:contacts:3.1.8
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cpe:2.3:a:nextcloud:contacts:3.1.9
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cpe:2.3:a:nextcloud:contacts:3.2.0
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cpe:2.3:a:nextcloud:contacts:3.3.0
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cpe:2.3:a:nextcloud:contacts:3.4.0
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cpe:2.3:a:nextcloud:contacts:3.4.1