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Vulnerability from bitnami_vulndb
Published
2026-08-17 05:44
Modified
2026-08-17 06:10
Summary
Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing
Details

Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0, 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.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "discourse",
        "purl": "pkg:bitnami/discourse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.1.7"
            },
            {
              "introduced": "2026.6.0"
            },
            {
              "fixed": "2026.6.2"
            },
            {
              "introduced": "2026.7.0"
            },
            {
              "fixed": "2026.7.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72720"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Discourse is an open-source discussion platform. Prior to 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0, 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.",
  "id": "BIT-discourse-2026-72720",
  "modified": "2026-08-17T06:10:32.268Z",
  "published": "2026-08-17T05:44:18.972Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/234ee88a5b9b53bf938c53351eab20130323485f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/4b639a52f47fb3d46093bece9df147e4e9517a11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/a5d3b112d598242c1d1803d5a77bf98d5fdabd75"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/b25a074b165253e01fc4c8911b980fc68338ea16"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42244"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42245"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42246"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42247"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-3q6f-6gm9-m35v"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72720"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Discourse: HTML injection in PrettyText.format_for_email from cooked-attribute reparsing"
}



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