CVEvulnerability
CVE-2026-72720
6.4 MEDIUM
Official page ↗
- Status
- Deferred
- Published
- 2026-08-10
- Last modified
- 2026-09-08
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weaknesses
- CWE-79
Description
Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1, Discourse has HTML injection in PrettyText.format_for_email because cooked attribute values are reparsed as markup. Crafted Vimeo iframe sources, secure-upload URLs or dimensions, and hashtag data-slug values can cause decoded attribute text to be reinterpreted as HTML. The vulnerable conversion also fails to strictly validate the Vimeo iframe host and path, allowing non-Vimeo allowlisted iframes to be converted. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.
Related
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f github.com
- https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11 github.com
- https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75 github.com
- https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16 github.com
- https://github.com/discourse/discourse/pull/42244 github.com
- https://github.com/discourse/discourse/pull/42245 github.com
- https://github.com/discourse/discourse/pull/42246 github.com
- https://github.com/discourse/discourse/pull/42247 github.com
- https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v github.com