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Presence of restricted personal Discourse messages may be leaked if tagged with a tag

Type: advisorySources: OSV

Discourse is an open-source messaging platform. In versions 3.0.1 and prior on the `stable` branch and versions 3.1.0.beta2 and prior on the `beta` and `tests-passed` branches, the count of personal messages displayed for a tag is a count of all personal messages regardless of whether the personal message is visible to a given user. As a result, any users can technically poll a sensitive tag to determine if a new personal message is created even if the user does not have access to the personal message. In the patched versions, the count of personal messages tagged with a given tag is hidden by default. To revert to the old behaviour of displaying the count of personal messages for a given tag, an admin may enable the `display_personal_messages_tag_counts` site setting.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-23935
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 17:06 UTC · Revision 1

Source evidence

Presence of restricted personal Discourse messages may be leaked if tagged with a tag

core-osv · Original source

Published 16 Mar 2023, 20:21 UTC

Discourse is an open-source messaging platform. In versions 3.0.1 and prior on the `stable` branch and versions 3.1.0.beta2 and prior on the `beta` and `tests-passed` branches, the count of personal messages displayed for a tag is a count of all personal messages regardless of whether the personal message is visible to a given user. As a result, any users can technically poll a sensitive tag to determine if a new personal message is created even if the user does not have access to the personal message. In the patched versions, the count of personal messages tagged with a given tag is hidden by default. To revert to the old behaviour of displaying the count of personal messages for a given tag, an admin may enable the `display_personal_messages_tag_counts` site setting.

osv:CVE-2023-23935
Complete source record
{
  "id": "0a09947cf80e4d3f5f5d329182d645782b194566ecfea4ca1a4a12592433d9cb",
  "url": "https://osv.dev/vulnerability/CVE-2023-23935",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Presence of restricted personal Discourse messages may be leaked if tagged with a tag",
    "summary": "Discourse is an open-source messaging platform. In versions 3.0.1 and prior on the `stable` branch and versions 3.1.0.beta2 and prior on the `beta` and `tests-passed` branches, the count of personal messages displayed for a tag is a count of all personal messages regardless of whether the personal message is visible to a given user. As a result, any users can technically poll a sensitive tag to determine if a new personal message is created even if the user does not have access to the personal message. In the patched versions, the count of personal messages tagged with a given tag is hidden by default. To revert to the old behaviour of displaying the count of personal messages for a given tag, an admin may enable the `display_personal_messages_tag_counts` site setting.",
    "evidence": "osv:CVE-2023-23935",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2023-23935",
      "aliases": [
        "BIT-discourse-2023-23935",
        "CVE-2023-23935",
        "GHSA-rf8j-mf8c-82v7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/discourse/discourse",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4571b10ee5a3c46249271b2870d6eaf37994460f"
                },
                {
                  "fixed": "f31f0b70f82c43d93220ce6fc0d4f57440452f37"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "stable <= 3.0.1"
                      },
                      {
                        "last_affected": "stable <= 3.0.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "beta <= 3.1.0.beta2"
                      },
                      {
                        "last_affected": "beta <= 3.1.0.beta2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "tests-passed <= 3.1.0.beta2"
                      },
                      {
                        "last_affected": "tests-passed <= 3.1.0.beta2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f31f0b70f82c43d93220ce6fc0d4f57440452f37"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-23935.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.673293722Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/23xxx/CVE-2023-23935.json",
        "https://github.com/discourse/discourse/security/advisories/GHSA-rf8j-mf8c-82v7",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-23935",
        "https://github.com/discourse/discourse/commit/f31f0b70f82c43d93220ce6fc0d4f57440452f37"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/23xxx/CVE-2023-23935.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-23935",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505148,
  "published_at": "2023-03-16T20:21:13.539+00:00"
}