CVE-2017-20290

原文の説明

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.

影響を受けるソフトウェア

• Discourse ≥ 1.9.0.beta2 < 1.9.0.beta13 修正バージョン: 1.9.0.beta13 リポジトリ・パッケージ一致

詳細

公開日

2026-10-22

最終更新

2026-11-06

CVSS ベクター

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

CWE

CWE-79

参考資料

• cve.org/CVE-2017-20290
• nvd.nist.gov/vuln/detail/CVE-2017-20290
• github.com/discourse/discourse/commit/a6f2533d38
• github.com/discourse/discourse/commit/6e37f09b19
• github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/discours...
• www.vulncheck.com/advisories/discourse-1.9.0-beta13-reflected-xss-via-email-unsubscribed