CVE-2026-72730CWE-79cross-site-scripting

CVE-2026-72730

High · published August 10, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
36.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00430 · 36.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-10T21:17Z
References (5)
https://github.com/discourse/discourse/commit/32920affe4ad97b461ca2ae2f664c5fefc374baf · [email protected]https://github.com/discourse/discourse/commit/3fb1e8ead0d4f48d2cf55c8110825c7e8a6a45f5 · [email protected]https://github.com/discourse/discourse/commit/7eb35d076ab9b6a612e86182336ce9787ce402ea · [email protected]https://github.com/discourse/discourse/commit/9633b8ecaf5a99f0407f5261b9bd1a05f7dac529 · [email protected]https://github.com/discourse/discourse/security/advisories/GHSA-wg48-qxjc-f459 · [email protected]
EPSS history
Timeline
  • 10 AUG 16:17Z
    Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
    cvelistv5