PT-2026-22194 · Discourse · Discourse

Davidtaylorhq · Published 2026-02-26 · Updated 2026-03-03 · CVE-2026-27154

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Discourse versions prior to 2025.12.2 Discourse versions prior to 2026.1.1 Discourse versions prior to 2026.2.0

Description Discourse, an open source discussion platform, contains a flaw where a user's full name can be interpreted as raw HTML under specific conditions. This occurs when the display name on posts setting is set to true and the prioritize username in ux setting is set to false. Editing a post created by a malicious user can trigger a cross-site scripting (XSS) attack.

Recommendations Update to Discourse version 2025.12.2 or later. Update to Discourse version 2026.1.1 or later. Update to Discourse version 2026.2.0 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-DISCOURSE-2026-27154

CVE-2026-27154

GHSA-XV43-5GCP-WGW8

Affected Products

Discourse

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27154.json · Exploit
• https://github.com/discourse/discourse/security/advisories/GHSA-xv43-5gcp-wgw8 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-27154 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27154 · Security Note
• https://osv.dev/vulnerability/BIT-discourse-2026-27154 · Vendor Advisory
• https://twitter.com/CVEnew/status/2027466654830235849 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2027241769952321686 · Twitter Post