CVE-2026-59828 (GCVE-0-2026-59828)
Vulnerability from cvelistv5
Published
2026-07-09 22:04
Modified
2026-07-10 14:17
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Summary
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
References
Impacted products
Vendor Product Version
discourse discourse Version: >= 2026.1.0-latest, < 2026.1.5
Version: >= 2026.4.0-latest, < 2026.4.2
Version: >= 2026.5.0-latest, < 2026.5.1
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-59828",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-10T14:17:36.503953Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-10T14:17:45.659Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "discourse",
          "vendor": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2026.1.0-latest, \u003c 2026.1.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.4.0-latest, \u003c 2026.4.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.5.0-latest, \u003c 2026.5.1"
            }
          ]
        }
      ],
      "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, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-09T22:04:50.777Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx"
        },
        {
          "name": "https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6"
        },
        {
          "name": "https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d"
        },
        {
          "name": "https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435"
        },
        {
          "name": "https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511"
        },
        {
          "name": "https://github.com/discourse/discourse/releases/tag/v2026.1.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5"
        },
        {
          "name": "https://github.com/discourse/discourse/releases/tag/v2026.4.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2"
        },
        {
          "name": "https://github.com/discourse/discourse/releases/tag/v2026.5.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1"
        },
        {
          "name": "https://github.com/discourse/discourse/releases/tag/v2026.6.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0"
        }
      ],
      "source": {
        "advisory": "GHSA-q456-4f8q-42vx",
        "discovery": "UNKNOWN"
      },
      "title": "Discourse: Hidden post revisions leak through adjacent visible diffs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-59828",
    "datePublished": "2026-07-09T22:04:50.777Z",
    "dateReserved": "2026-07-07T15:00:50.979Z",
    "dateUpdated": "2026-07-10T14:17:45.659Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Discourse: Hidden post revisions leak through adjacent visible diffs\", \"source\": {\"advisory\": \"GHSA-q456-4f8q-42vx\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}], \"affected\": [{\"vendor\": \"discourse\", \"product\": \"discourse\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 2026.1.0-latest, \u003c 2026.1.5\"}, {\"status\": \"affected\", \"version\": \"\u003e= 2026.4.0-latest, \u003c 2026.4.2\"}, {\"status\": \"affected\", \"version\": \"\u003e= 2026.5.0-latest, \u003c 2026.5.1\"}]}], \"references\": [{\"url\": \"https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx\", \"name\": \"https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6\", \"name\": \"https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d\", \"name\": \"https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435\", \"name\": \"https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511\", \"name\": \"https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/releases/tag/v2026.1.5\", \"name\": \"https://github.com/discourse/discourse/releases/tag/v2026.1.5\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/releases/tag/v2026.4.2\", \"name\": \"https://github.com/discourse/discourse/releases/tag/v2026.4.2\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/releases/tag/v2026.5.1\", \"name\": \"https://github.com/discourse/discourse/releases/tag/v2026.5.1\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/discourse/discourse/releases/tag/v2026.6.0\", \"name\": \"https://github.com/discourse/discourse/releases/tag/v2026.6.0\", \"tags\": [\"x_refsource_MISC\"]}], \"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, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-07-09T22:04:50.777Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-59828\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-10T14:17:36.503953Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-07-10T14:17:40.868Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-59828\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-09T22:04:50.777Z\", \"dateReserved\": \"2026-07-07T15:00:50.979Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-07-09T22:04:50.777Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.