CVE-2025-48954

HIGH NUCLEI

Discourse <3.5.0.beta6 - XSS

Title source: llm

Description

Discourse is an open-source discussion platform. Versions prior to 3.5.0.beta6 are vulnerable to cross-site scripting when the content security policy isn't enabled when using social logins. Version 3.5.0.beta6 patches the issue. As a workaround, have the content security policy enabled.

Nuclei Templates (1)

Discourse OAuth Social Login - Cross-site Scripting

HIGHVERIFIEDby ferreiraklet,DhiyaneshDK,pdresearch

Shodan: http.component:"Discourse"

FOFA: app="Discourse"

References (1)

[Vendor Advisory] https://github.com/discourse/discourse/security/advisories/GHSA-26p5-mjjh-wfcf

Scores

CVSS v3 8.1

EPSS 0.1012

EPSS Percentile 93.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Details

CWE

CWE-79

Status published

Products (2)

discourse/discourse 3.5.0 beta1 (5 CPE variants)

discourse/discourse < 3.5.0

Published Jun 25, 2025

Tracked Since Feb 18, 2026