Vulnerability from bitnami_vulndb
Published
2026-08-17 05:44
Modified
2026-08-17 06:10
Summary
Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch
Details

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "discourse",
        "purl": "pkg:bitnami/discourse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.1.6"
            },
            {
              "introduced": "2026.5.0"
            },
            {
              "fixed": "2026.5.2"
            },
            {
              "introduced": "2026.6.0"
            },
            {
              "fixed": "2026.6.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72724"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.",
  "id": "BIT-discourse-2026-72724",
  "modified": "2026-08-17T06:10:32.268Z",
  "published": "2026-08-17T05:44:26.455Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42091"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42092"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42093"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/42094"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72724"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch"
}



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