Is CVE-2017-20290 being exploited?

No public exploit is currently tracked.

How severe is CVE-2017-20290?

CVE-2017-20290 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2017-20290

Description

Discourse 1.9.0.beta2 before 1.9.0.beta13 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the email parameter of /email/unsubscribed. Attackers can craft GET requests with SVG onload payloads, which unsubscribed.html.erb renders unescaped via html_safe, executing JavaScript in victims' browsers. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-19.