High severity · published Aug 10, 2026
CVE-2026-72730
Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
8.7
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
< 2026.1.6; >= 2026.5.0-latest, < 2026.5.2; >= 2026.6.0-latest, < 2026.6.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72730
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72730
github.com
https://github.com/discourse/discourse/commit/32920affe4ad97b461ca2ae2f664c5fefc374baf
github.com
https://github.com/discourse/discourse/commit/3fb1e8ead0d4f48d2cf55c8110825c7e8a6a45f5
github.com
https://github.com/discourse/discourse/commit/7eb35d076ab9b6a612e86182336ce9787ce402ea
github.com
https://github.com/discourse/discourse/commit/9633b8ecaf5a99f0407f5261b9bd1a05f7dac529
github.com
https://github.com/discourse/discourse/security/advisories/GHSA-wg48-qxjc-f459
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