CVE-2017-20290mediumobserved exploitationCWE-79

CVE-2017-20290: medium-severity vulnerability in Discourse

Discourse < 1.9.0.beta13 Reflected XSS via /email/unsubscribed

Published

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35Vexday Risk Score

Prioritize patching. It exploitation observed by VulnCheck.

ssvc Attendcvss 5.1epss 0.3%
from disclosure to weapon
Published on NVDOct 22
VulnCheckOct 22
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
Discourse · Discourse