Vulnerability-Lookup

CNVD-2026-17256

Vulnerability from cnvd - Published: 2026-04-15

Title

Discourse信息泄露漏洞（CNVD-2026-17256）

Description

Discourse是Discourse开源的一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在信息泄露漏洞，攻击者可利用该漏洞导致版主获取隐藏群组名称和用户数量信息。

Severity

中

Patch Name

Discourse信息泄露漏洞（CNVD-2026-17256）的补丁

Patch Description

Discourse是Discourse开源的一套开源的社区讨论平台。该平台包括社区、电子邮件和聊天室等功能。 Discourse存在信息泄露漏洞，攻击者可利用该漏洞导致版主获取隐藏群组名称和用户数量信息。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/discourse/discourse/tags

Reference

https://github.com/discourse/discourse/commit/07f66658cce81a099a0d7115db5f3c69f5d3cca2

Impacted products

Name
['Discourse Discourse <2026.3.0', 'Discourse Discourse <2026.1.3', 'Discourse Discourse <2026.2.2']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-33300",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-33300"
    }
  },
  "description": "Discourse\u662fDiscourse\u5f00\u6e90\u7684\u4e00\u5957\u5f00\u6e90\u7684\u793e\u533a\u8ba8\u8bba\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5305\u62ec\u793e\u533a\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u804a\u5929\u5ba4\u7b49\u529f\u80fd\u3002\n\nDiscourse\u5b58\u5728\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u7248\u4e3b\u83b7\u53d6\u9690\u85cf\u7fa4\u7ec4\u540d\u79f0\u548c\u7528\u6237\u6570\u91cf\u4fe1\u606f\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/discourse/discourse/tags",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-17256",
  "openTime": "2026-04-15",
  "patchDescription": "Discourse\u662fDiscourse\u5f00\u6e90\u7684\u4e00\u5957\u5f00\u6e90\u7684\u793e\u533a\u8ba8\u8bba\u5e73\u53f0\u3002\u8be5\u5e73\u53f0\u5305\u62ec\u793e\u533a\u3001\u7535\u5b50\u90ae\u4ef6\u548c\u804a\u5929\u5ba4\u7b49\u529f\u80fd\u3002\r\n\r\nDiscourse\u5b58\u5728\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u7248\u4e3b\u83b7\u53d6\u9690\u85cf\u7fa4\u7ec4\u540d\u79f0\u548c\u7528\u6237\u6570\u91cf\u4fe1\u606f\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Discourse\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2026-17256\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Discourse Discourse \u003c2026.3.0",
      "Discourse Discourse \u003c2026.1.3",
      "Discourse Discourse \u003c2026.2.2"
    ]
  },
  "referenceLink": "https://github.com/discourse/discourse/commit/07f66658cce81a099a0d7115db5f3c69f5d3cca2",
  "serverity": "\u4e2d",
  "submitTime": "2026-04-10",
  "title": "Discourse\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2026-17256\uff09"
}

CVE-2026-33300 (GCVE-0-2026-33300)

Vulnerability from cvelistv5 – Published: 2026-03-31 17:42 – Updated: 2026-04-01 18:34

Title

Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint

Summary

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass in the Category Chatables Controller show action allowed moderators to get information on hidden groups names and user count. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-01 18:34 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/discourse/discourse/security/a…	x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/07f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
discourse	discourse	Affected: >= 2026.1.0-latest, < 2026.1.3 Affected: >= 2026.2.0-latest, < 2026.2.2 Affected: >= 2026.3.0-latest, < 2026.3.0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33300",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-01T18:34:07.503883Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-01T18:34:16.767Z",
          "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 2026.1.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.2.0-latest, \u003c 2026.2.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.3.0-latest, \u003c 2026.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass in the Category Chatables Controller show action allowed moderators to get information on hidden groups names and user count. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-31T17:42:00.882Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/discourse/discourse/security/advisories/GHSA-wrwm-vqx2-6x4v",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/discourse/discourse/security/advisories/GHSA-wrwm-vqx2-6x4v"
        },
        {
          "name": "https://github.com/discourse/discourse/commit/07f66658cce81a099a0d7115db5f3c69f5d3cca2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/discourse/discourse/commit/07f66658cce81a099a0d7115db5f3c69f5d3cca2"
        }
      ],
      "source": {
        "advisory": "GHSA-wrwm-vqx2-6x4v",
        "discovery": "UNKNOWN"
      },
      "title": "Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33300",
    "datePublished": "2026-03-31T17:42:00.882Z",
    "dateReserved": "2026-03-18T18:55:47.427Z",
    "dateUpdated": "2026-04-01T18:34:16.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CNVD-2026-17256

CVE-2026-33300 (GCVE-0-2026-33300)

Tags

Sightings

Nomenclature

Related by attack behaviour