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CVE-2025-48954— Discourse vulnerable to XSS via user-provided query parameter in oauth failure flow

Quick assessment

Affected
discourse discourse
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Discourse是Discourse开源的一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse 3.5.0.beta6之前版本存在跨站脚本漏洞，该漏洞源于未启用内容安全策略时可能导致跨站脚本攻击。

CVSS 8.1 · High EPSS 0.74% · P54

Public Exploits 1

Nuclei · 1 CVE-2025-48954.yaml [template]
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I. Basic Information for CVE-2025-48954

Vulnerability Information
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Vulnerability Title
Discourse vulnerable to XSS via user-provided query parameter in oauth failure flow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse开源的一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse 3.5.0.beta6之前版本存在跨站脚本漏洞，该漏洞源于未启用内容安全策略时可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse < 3.5.0.beta6 -

II. Public POCs for CVE-2025-48954

# POC Description Source Link Shenlong Link
1 Discourse versions prior to 3.5.0.beta6 contain a stored Cross-Site Scripting (XSS) vulnerability in the OAuth/social login functionality. The vulnerability is caused by lack of proper content security policy enforcement when processing social login failures,allowing remote attackers to inject and execute malicious scripts in users' browsers. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-48954.yaml POC Details
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III. Intelligence Information for CVE-2025-48954

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IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-79

V. Comments for CVE-2025-48954

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