Vulnerability Details CVE-2019-16216
Zulip server before 2.0.5 incompletely validated the MIME types of uploaded files. A user who is logged into the server could upload files of certain types to mount a stored cross-site scripting attack on other logged-in users. On a Zulip server using the default local uploads backend, the attack is only effective against browsers lacking support for Content-Security-Policy such as Internet Explorer 11. On a Zulip server using the S3 uploads backend, the attack is confined to the origin of the configured S3 uploads hostname and cannot reach the Zulip server itself.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.9%
CVSS Severity
CVSS v3 Score 5.4
CVSS v2 Score 3.5
References
Products affected by CVE-2019-16216
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cpe:2.3:a:zulip:zulip_server:1.8.0
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cpe:2.3:a:zulip:zulip_server:1.8.1
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cpe:2.3:a:zulip:zulip_server:1.9.0
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cpe:2.3:a:zulip:zulip_server:1.9.1
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cpe:2.3:a:zulip:zulip_server:1.9.2
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cpe:2.3:a:zulip:zulip_server:2.0.0
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cpe:2.3:a:zulip:zulip_server:2.0.1
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cpe:2.3:a:zulip:zulip_server:2.0.2
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cpe:2.3:a:zulip:zulip_server:2.0.3
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cpe:2.3:a:zulip:zulip_server:2.0.4