Cross-Site Scripting Vulnerability in Discourse Discussion Platform
CVE-2026-27154

1.3LOW

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
26 February 2026

What is CVE-2026-27154?

A vulnerability in the Discourse discussion platform allows user full names to be processed as raw HTML, potentially leading to Cross-Site Scripting (XSS) attacks. This occurs when the settings 'display_name_on_posts' is enabled and 'prioritize_username_in_ux' is disabled. Malicious users can exploit this issue by editing their posts, enabling the execution of malicious scripts in the browsers of users who view the post. To mitigate the risk, updating to versions 2025.12.2, 2026.1.1, or 2026.2.0 is essential, as these versions contain the necessary patches.

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Deploy the Patch

Affected Version(s)

discourse < 2025.12.2 < 2025.12.2

discourse >= 2026.1.0-latest, < 2026.1.1 < 2026.1.0-latest, 2026.1.1

discourse >= 2026.2.0-latest, < 2026.2.0 < 2026.2.0-latest, 2026.2.0

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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