CVE-2026-27154 | THREATINT

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.

PUBLISHED Reserved 2026-02-18 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

LOW: 1.3CVSS: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

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 2025.12.2

affected

>= 2026.1.0-latest, < 2026.1.1

affected

>= 2026.2.0-latest, < 2026.2.0

affected

References

github.com/...course/security/advisories/GHSA-xv43-5gcp-wgw8

cve.org (CVE-2026-27154)

nvd.nist.gov (CVE-2026-27154)

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