{"id":56585,"date":"2025-07-02T00:57:29","date_gmt":"2025-07-02T00:57:29","guid":{"rendered":""},"modified":"2025-09-08T17:19:05","modified_gmt":"2025-09-08T23:19:05","slug":"cve-2025-48954-cross-site-scripting-vulnerability-in-discourse-social-login","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-48954-cross-site-scripting-vulnerability-in-discourse-social-login\/","title":{"rendered":"CVE-2025-48954: Cross-Site Scripting Vulnerability in Discourse Social Login<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

This blog post discusses a significant cybersecurity vulnerability, classified under CVE-2025-48954, that affects the open-source discussion platform, Discourse. The vulnerability results from an improper content security policy (CSP) handling, leading to a potential cross-site scripting (XSS) attack when using social logins. This issue plagues all versions of Discourse prior<\/a> to 3.5.0.beta6.
\nThe severity of this vulnerability lies in its potential to compromise systems or lead<\/a> to data leaks, impacting not just individual users but also businesses that leverage Discourse for community engagement. A successful exploit could lead to unauthorized control<\/a> over data and systems, creating a serious security threat.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-48954
\nSeverity: High (CVSS: 8.1)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise or data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Discourse | Prior to 3.5.0.beta6<\/p>\n

How the Exploit Works<\/strong><\/p>\n

This vulnerability arises from the Discourse platform’s<\/a> failure to enforce a content security policy when using social logins. An attacker can exploit this flaw by injecting malicious<\/a> scripts into the webpage. When a user interacts with the infected application, the malicious script is executed, potentially leading to unauthorized access<\/a> to sensitive data or control over the system.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of how an attacker might exploit this vulnerability using an HTTP request<\/a>:<\/p>\n

POST \/social_login HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"callback_url\": \"javascript:malicious_code_here\"\n}<\/code><\/pre>\n
In this pseudo-code, the “callback_url” contains malicious JavaScript code that can execute<\/a> when the user interacts with the social login feature.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
The recommended solution to protect against this vulnerability<\/a> is to upgrade to Discourse version 3.5.0.beta6 or later, which contains a patch for the issue. If an upgrade is not immediately possible, users should ensure that the content security policy<\/a> is enabled as a temporary workaround. Using Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can also provide temporary protection against potential exploits<\/a>. However, these measures should be seen as temporary fixes, and users are advised to apply the vendor patch for complete resolution of the vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This blog post discusses a significant cybersecurity vulnerability, classified under CVE-2025-48954, that affects the open-source discussion platform, Discourse. The vulnerability results from an improper content security policy (CSP) handling, leading to a potential cross-site scripting (XSS) attack when using social logins. This issue plagues all versions of Discourse prior to 3.5.0.beta6. The severity of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56585","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-xss"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t