FKIE_CVE-2026-72723

Vulnerability from fkie_nvd - Published: 2026-08-10 16:19 - Updated: 2026-08-10 21:17
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/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, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. 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/0248e9ca82d0493037a9ca04d73904ccfad795f9
security-advisories@github.comhttps://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7
security-advisories@github.comhttps://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac
security-advisories@github.comhttps://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde
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-4p6q-h74v-5j7p
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, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0."
    }
  ],
  "id": "CVE-2026-72723",
  "lastModified": "2026-08-10T21:17:23.923",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72723",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-10T19:02:43.987708Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-10T16:19:49.667",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/0248e9ca82d0493037a9ca04d73904ccfad795f9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/03444ddb74d535dda557350f4c5800a6ec2669d7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/900f51c147913f667e64484c2f2dd48c723314ac"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/discourse/discourse/commit/da84c677213cac3b024e753f180f45472b89efde"
    },
    {
      "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-4p6q-h74v-5j7p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.