Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor (CVE-2026-72730) | HOL Guard CVE

High · CVSS 8.7CVE-2026-72730

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

Answer in brief

CVE-2026-72730 records a High severity (CVSS 8.7) vulnerability in Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor. The current sources do not mark it as known exploited. The current feed maps discourse/discourse (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Sep 8, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps discourse/discourse (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
discourse/discoursegeneric	< 2026.1.6 \|\| >= 2026.5.0-latest, < 2026.5.2 \|\| >= 2026.6.0-latest, < 2026.6.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for discourse/discourse.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

Discourse 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.

Quoted source text, attributed separately from HOL analysis.