Stored Cross-Site Scripting Vulnerability in Discourse Rich Text Editor
CVE-2026-72730

8.7HIGH

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
10 August 2026

What is CVE-2026-72730?

The Rich Text Editor in Discourse, prior to specific versions, vulnerability permits the rendering of chat-transcript usernames as HTML. This flaw allows an attacker to execute stored cross-site scripting (XSS) attacks, potentially compromising user data and session integrity. Users are strongly advised to upgrade to versions 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0, which contain crucial fixes to mitigate this risk.

Affected Version(s)

discourse < 2026.1.6 < 2026.1.6

discourse >= 2026.5.0-latest, < 2026.5.2 < 2026.5.0-latest, 2026.5.2

discourse >= 2026.6.0-latest, < 2026.6.1 < 2026.6.0-latest, 2026.6.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/32920affe4a...
x_refsource_MISC
https://github.com/discourse/discourse/commit/3fb1e8ead0d...
x_refsource_MISC

CVSS V3.1

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.