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CVE-2026-53961

Estado: AnalizadaMedia (6.5)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Discourse — Discourse

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-53961",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53961",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-10T13:44:24.781167Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "discourse",
          "product": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": ">= 2026.5.0-latest, < 2026.5.1"
            },
            {
              "status": "affected",
              "version": ">= 2026.4.0-latest, < 2026.4.2"
            },
            {
              "status": "affected",
              "version": ">= 2026.1.0-latest, < 2026.1.5"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-07-09T22:17:05.440",
  "references": [
    {
      "url": "https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94",
      "tags": [
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    },
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      "url": "https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea",
      "tags": [
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      "source": "security-advisories@github.com"
    },
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      "url": "https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-07-14T20:37:07.063",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E41661D7-5D61-44CF-BFEA-57C53057A46F",
              "versionEndExcluding": "2026.1.5",
              "versionStartIncluding": "2026.1.0"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E594AEEC-13D5-48EE-AE07-0C3C25FBBC72",
              "versionEndExcluding": "2026.4.2",
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            },
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              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
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              "matchCriteriaId": "CD722A52-B00A-4548-92CA-807CEB0449B0",
              "versionEndExcluding": "2026.5.1",
              "versionStartIncluding": "2026.5.0"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F2E7E180-2D99-484E-80A8-12F706ABDE65"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}