FKIE_CVE-2026-72724

Vulnerability from fkie_nvd - Published: 2026-08-10 16:19 - Updated: 2026-08-11 03:18
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75
security-advisories@github.comhttps://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c
security-advisories@github.comhttps://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f
security-advisories@github.comhttps://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce
security-advisories@github.comhttps://github.com/discourse/discourse/pull/42091
security-advisories@github.comhttps://github.com/discourse/discourse/pull/42092
security-advisories@github.comhttps://github.com/discourse/discourse/pull/42093
security-advisories@github.comhttps://github.com/discourse/discourse/pull/42094
security-advisories@github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "discourse",
          "vendor": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.1.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.5.0-latest, \u003c 2026.5.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.6.0-latest, \u003c 2026.6.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.7.0-latest, \u003c 2026.7.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-72724",
  "lastModified": "2026-08-11T03:18:01.553",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72724",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-11T01:57:32.913192Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-10T16:19:49.810",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/pull/42091"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/pull/42092"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/pull/42093"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/pull/42094"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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