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CVE-2025-32376— Discourse DM limits aren’t always properly enforced

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 3.4.3之前版本和3.5.0.beta3之前版本存在访问控制错误漏洞，该漏洞源于绕过用户限制，可能导致创建包含所有用户的私信。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery
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I. Basic Information for CVE-2025-32376

Vulnerability Information
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Vulnerability Title
Discourse DM limits aren’t always properly enforced
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to versions 3.4.3 on the stable branch and 3.5.0.beta3 on the beta branch, the users limit for a DM can be bypassed, thus giving the ability to potentially create a DM with every user from a site in it. This issue has been patched in stable version 3.4.3 and beta version 3.5.0.beta3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 访问控制错误漏洞
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 3.4.3之前版本和3.5.0.beta3之前版本存在访问控制错误漏洞，该漏洞源于绕过用户限制，可能导致创建包含所有用户的私信。
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 < 3.4.3 -

II. Public POCs for CVE-2025-32376

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III. Intelligence Information for CVE-2025-32376

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Patches & Fixes for CVE-2025-32376 (1)

Vendor Advisories for CVE-2025-32376 (1)

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-284

V. Comments for CVE-2025-32376

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