CVE-2026-72720Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing
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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.
- CVSS
- 6.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
discourse discourse discourse:discourse (from the name) | before 2026.1.7; from 2026.6.0-latest, < 2026.6.2; from 2026.7.0-latest, < 2026.7.1; from 2026.8.0-latest, < 2026.8.0-latest.1 | CNA record |
References
- https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35vx-refsource-confirm
- https://github.com/discourse/discourse/pull/42244x-refsource-misc
- https://github.com/discourse/discourse/pull/42245x-refsource-misc
- https://github.com/discourse/discourse/pull/42246x-refsource-misc
- https://github.com/discourse/discourse/pull/42247x-refsource-misc
- https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485fx-refsource-misc
- https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11x-refsource-misc
- https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75x-refsource-misc
- https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.