CVE-2026-55674

Katalog CVE

CVSS 9.3 · Critical EPSS 0,59%

Kerentanan Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). Skor CVSS 3.1 9.3 (Critical) menurut github.com.

Deskripsi (NVD)

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, an unauthenticated attacker could send a single request with a crafted color_scheme_id (or dark_scheme_id) cookie to inject arbitrary HTML into a Discourse page. Because the cookie value was rendered into a color scheme tag without escaping, the attacker could break out of the attribute and inject a tag that bypassed Discourse's nonce-based Content Security Policy, resulting in arbitrary JavaScript execution in visitors' browsers. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Rincian

Terbit di NVD

17 Agustus 2026

Terakhir diubah

18 September 2026

Status NVD

Deferred

CVSS 3.1

9.3 (Critical), sumber github.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

EPSS (30 hari)

0,59% peluang dieksploitasi; lebih tinggi dari 46,7% CVE lain

Produk dan versi terdampak

NVD belum mencantumkan data produk (CPE) untuk CVE ini. Produk yang terdampak biasanya disebut di deskripsi dan di advisory vendor pada daftar referensi.

Referensi dan perbaikan

• https://github.com/discourse/discourse/security/advisories/GHSA-qx4v-rg4v-pm2g