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CVE-2026-27154— Discourse has XSS when editing a malicious post

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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在跨站脚本漏洞，该漏洞源于特定设置下用户全名可能被评估为原始HTML，可能导致编辑恶意用户帖子时触发跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.29% · P19
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I. Basic Information for CVE-2026-27154

Vulnerability Information
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Vulnerability Title
Discourse has XSS when editing a malicious post
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, a user full name can be evaluated as raw HTML when the following settings are set: `display_name_on_posts` => true; and `prioritize_username_in_ux` => false. Editing a post of a malicious user would trigger an XSS. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U
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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在跨站脚本漏洞，该漏洞源于特定设置下用户全名可能被评估为原始HTML，可能导致编辑恶意用户帖子时触发跨站脚本攻击。
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 < 2025.12.2 -

II. Public POCs for CVE-2026-27154

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III. Intelligence Information for CVE-2026-27154

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Same Patch Batch · discourse · 2026-02-26 · 17 CVEs total

CVE-2026-26265 7.5 HIGH Discourse has IDOR vulnerability in the directory items endpoint
CVE-2026-26078 7.5 HIGH Discourse has authentication bypass vulnerability in the Patreon plugin webhook endpoint
CVE-2026-26077 6.5 MEDIUM Discourse doesn't ensure webhooks require a token
CVE-2026-26207 5.4 MEDIUM DIscourse's discourse-policy plugin lacks post access check
CVE-2026-26973 4.3 MEDIUM Discourse doesn't scope reviewable notes to user-visible reviewables
CVE-2026-28227 Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Tim
CVE-2026-28219 Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Bann
CVE-2026-28218 Discourse's Fail-Open Access Control in Data Explorer Plugin Allows Unauthorized SQL Query
CVE-2026-27153 Discourse doesn't prevent moderators from exporting user Chat DMs
CVE-2026-27152 DIscourse has DM communication-preference bypass when adding members
CVE-2026-27162 DIscourse doesn't prevent whispers to leak in excerpts
CVE-2026-27151 Discourse doesn't validate destination topic when moving posts
CVE-2026-27150 Discourse doesn't ensure guardian check when creating QueryGroupBookmark
CVE-2026-27149 Discourse has SQL injection in PM tag filtering
CVE-2026-27021 Discourse: Poll voters endpoint lacked post visibility checks
CVE-2026-26979 Discourse: TL4 users are able to change status of restricted topics

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-27154

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