Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72730
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 17:17:37 UTC
Updated2026-08-10 19:17:33 UTC
DescriptionDiscourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the Rich Text Editor rendered a chat-transcript username as HTML, allowing stored cross-site scripting. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Risk And Classification

Primary CVSS: v3.1 8.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED8.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Discourse Discourse affected < 2026.1.6 Not specified
CNA Discourse Discourse affected >= 2026.5.0-latest, < 2026.5.2 Not specified
CNA Discourse Discourse affected >= 2026.6.0-latest, < 2026.6.1 Not specified

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/9633b8ecaf5a99f0407f5261b9bd1a05f7... [email protected] github.com
github.com/discourse/discourse/commit/3fb1e8ead0d4f48d2cf55c8110825c7e8a... [email protected] github.com
github.com/discourse/discourse/commit/32920affe4ad97b461ca2ae2f664c5fefc... [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-wg48-qxjc-f459 [email protected] github.com
github.com/discourse/discourse/commit/7eb35d076ab9b6a612e86182336ce9787c... [email protected] github.com
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