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CVE-2025-22602— Stored DOM-based XSS (without CSP) via video placeholders in Discourse

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在跨站脚本漏洞，该漏洞源于攻击者可以通过发布含有恶意视频占位符HTML元素的帖子在用户的浏览器上执行任意JavaScript代码。

CVSS 6.5 · Medium EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2025-22602

Vulnerability Information
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Vulnerability Title
Stored DOM-based XSS (without CSP) via video placeholders in Discourse
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
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存在跨站脚本漏洞，该漏洞源于攻击者可以通过发布含有恶意视频占位符HTML元素的帖子在用户的浏览器上执行任意JavaScript代码。
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 stable: <= 3.3.3 -

II. Public POCs for CVE-2025-22602

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III. Intelligence Information for CVE-2025-22602

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Vendor Advisories for CVE-2025-22602 (1)

Same Patch Batch · discourse · 2025-02-04 · 9 CVEs total

CVE-2024-55948 8.2 HIGH Anonymous cache poisoning via XHR requests in Discourse
CVE-2025-23023 8.2 HIGH Anonymous cache poisoning via request headers in Discourse
CVE-2024-56328 6.5 MEDIUM HTMLi(XSS without CSP) via Onebox urls in Discourse
CVE-2024-53266 4.3 MEDIUM Cross-site Scripting (XSS) via topic titles when CSP disabled in Discourse
CVE-2024-53851 4.3 MEDIUM Partial denial of service via inline oneboxes in Discourse
CVE-2024-53994 4.3 MEDIUM Potential bypass of chat permissions in Discourse
CVE-2025-22601 3.1 LOW Client Side Path Traversal using activate account route in Discourse
CVE-2024-56197 2.2 LOW Users can see other user's tagged PMs in Discourse

IV. Related Vulnerabilities

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