Vulnerability from bitnami_vulndb
Published
2026-03-27 07:10
Modified
2026-03-31 21:15
Summary
Discourse vulnerable to group membership addition permission bypass via discourse-policy plugin
Details

Discourse is an open-source discussion platform. Versions prior to 2026.3.0, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of add-users-to-group and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the policy_enabled site setting.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "discourse",
        "purl": "pkg:bitnami/discourse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2026.1.0"
            },
            {
              "fixed": "2026.1.2"
            },
            {
              "introduced": "2026.2.0"
            },
            {
              "fixed": "2026.2.1"
            },
            {
              "introduced": "2026.3.0"
            },
            {
              "fixed": "2026.4.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28282"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*"
    ],
    "severity": "Low"
  },
  "details": "Discourse is an open-source discussion platform. Versions prior to 2026.3.0, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of `add-users-to-group` and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the `policy_enabled` site setting.",
  "id": "BIT-discourse-2026-28282",
  "modified": "2026-03-31T21:15:21.591Z",
  "published": "2026-03-27T07:10:17.839Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/64e2514ac17046cfaa8bc68a3c5140bc40736add"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/c14b8a4cc5fc94e4839a83c5d55765897589f45b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/commit/dcde9de530f515e88f99957056ffbcc2e1e03951"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pf"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28282"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Discourse vulnerable to group membership addition permission bypass via discourse-policy plugin"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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