{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "2026.1.0"
              },
              {
                "fixed": "2026.1.5"
              },
              {
                "introduced": "2026.4.0"
              },
              {
                "fixed": "2026.4.2"
              },
              {
                "introduced": "2026.5.0"
              },
              {
                "fixed": "2026.5.1"
              },
              {
                "introduced": "2026.6.0"
              },
              {
                "last_affected": "2026.6.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"
            },
            {
              "fixed": "c06899647d758493d95a5b301e573ffa3db1e878"
            },
            {
              "introduced": "fdd750d960e603415db62242eca3c30d68e366db"
            },
            {
              "fixed": "4bbdddfc6700ca23604242111d4fa0e00347af97"
            },
            {
              "introduced": "640840d818f4ee9375829ece0ef452923bb0c012"
            },
            {
              "fixed": "598586ccf2e046a25d4b54132e4e1feb47f24e98"
            },
            {
              "introduced": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
            },
            {
              "fixed": "3a3d315a85ef3c6aabfc7e7bb38702059784f06b"
            },
            {
              "fixed": "61f12e13aa1b760f81d5ff60f12e3a7e77434b94"
            },
            {
              "fixed": "958f0cd831d65a49ec75f05343ca2c167679f0ea"
            },
            {
              "fixed": "aea35190791261bab258ebab05da279e78cdd0e6"
            },
            {
              "fixed": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
            }
          ],
          "repo": "https://github.com/discourse/discourse",
          "type": "GIT"
        }
      ],
      "versions": [
        "2026.6.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-8f9m-v436-wr3x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53961.json"
  },
  "details": "Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish validly signed forged Bounce notifications that revoke a targeted user email. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.",
  "id": "CVE-2026-53961",
  "modified": "2026-07-16T03:30:48.955297320Z",
  "published": "2026-07-09T21:48:11.449Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53961.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53961"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea"
    },
    {
      "type": "FIX",
      "url": "https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Discourse: Forged AWS SNS bounce notifications can disable a targeted user's email (missing TopicArn binding)"
}