CVE-2026-72730 json
Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
published 2026-08-10 2 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-72730 , EUVD-2026-55670 , GHSA-wg48-qxjc-f459
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami discourse 2026.1.6, 2026.5.2, 2026.6.1
- discourse discourse 2026.1.6, 2026.5.2, 2026.6.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| OSV | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <2026.1.6 >=2026.5.0, <2026.5.2 >=2026.6.0, <2026.6.1 |
2026.1.6 2026.5.2 2026.6.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/discourse/discourse/commit/32920affe4ad97b461ca2ae2f664c5fefc374baf
web
-
github.com
/discourse/discourse/commit/3fb1e8ead0d4f48d2cf55c8110825c7e8a6a45f5
web
-
github.com
/discourse/discourse/commit/7eb35d076ab9b6a612e86182336ce9787ce402ea
web
-
github.com
/discourse/discourse/commit/9633b8ecaf5a99f0407f5261b9bd1a05f7dac529
web
-
github.com
/discourse/discourse/security/advisories/GHSA-wg48-qxjc-f459
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-72730
web
Sources
- CVE List CVE-2026-72730
- NVD CVE-2026-72730
- OSV BIT-discourse-2026-72730
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.