Vulnerability Details CVE-2021-41101
wire-server is an open-source back end for Wire, a secure collaboration platform. Before version 2.106.0, the CORS ` Access-Control-Allow-Origin ` header set by `nginz` is set for all subdomains of `.wire.com` (including `wire.com`). This means that if somebody were to find an XSS vector in any of the subdomains, they could use it to talk to the Wire API using the user's Cookie. A patch does not exist, but a workaround does. To make sure that a compromise of one subdomain does not yield access to the cookie of another, one may limit the `Access-Control-Allow-Origin` header to apps that actually require the cookie (account-pages, team-settings and the webapp).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 53.3%
CVSS Severity
CVSS v3 Score 5.7
CVSS v2 Score 3.5
References
Products affected by CVE-2021-41101
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cpe:2.3:a:wire:wire_server:*