Is CVE-2021-41101 actively exploited?

No active exploitation of CVE-2021-41101 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-41101 be exploited remotely?

Yes. CVE-2021-41101 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-41101?

CVE-2021-41101 has a CVSS score of 5.7 (MEDIUM).

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MEDIUM

CVE-2021-41101

CWE-79Published: September 30, 2021· Updated: Jun 17, 2026

5.7

CVSS v3.1

Official Description

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).

NVD Source

Technical Analysis

CVE-2021-41101 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.7.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.