Vulnerability-Lookup

CNVD-2026-17480

Vulnerability from cnvd - Published: 2026-04-16

Title

Discourse存在未明漏洞（CNVD-2026-17480）

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存在安全漏洞，该漏洞源于权限验证不当，攻击者可利用该漏洞将管理员用户的私有主题元数据泄露给版主用户，即使版主无权访问这些私有主题。

Severity

中

Patch Name

Discourse存在未明漏洞（CNVD-2026-17480）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存在安全漏洞，该漏洞源于权限验证不当，攻击者可利用该漏洞将管理员用户的私有主题元数据泄露给版主用户，即使版主无权访问这些私有主题。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

目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载： https://github.com/discourse/discourse/security/advisories/GHSA-wxqr-r4wv-cw76

Reference

https://nvd.nist.gov/vuln/detail/CVE-2026-27935

Impacted products

Name
['Discourse Discourse <2026.1.2', 'Discourse Discourse <2026.2.1', 'Discourse Discourse <2026.3.0-latest.1']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-27935",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-27935"
    }
  },
  "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\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u6743\u9650\u9a8c\u8bc1\u4e0d\u5f53\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06\u7ba1\u7406\u5458\u7528\u6237\u7684\u79c1\u6709\u4e3b\u9898\u5143\u6570\u636e\u6cc4\u9732\u7ed9\u7248\u4e3b\u7528\u6237\uff0c\u5373\u4f7f\u7248\u4e3b\u65e0\u6743\u8bbf\u95ee\u8fd9\u4e9b\u79c1\u6709\u4e3b\u9898\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u7ecf\u53d1\u5e03\u4e86\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u8fd9\u4e2a\u5b89\u5168\u95ee\u9898\uff0c\u8bf7\u5230\u5382\u5546\u7684\u4e3b\u9875\u4e0b\u8f7d\uff1a\r\nhttps://github.com/discourse/discourse/security/advisories/GHSA-wxqr-r4wv-cw76",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-17480",
  "openTime": "2026-04-16",
  "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\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u6743\u9650\u9a8c\u8bc1\u4e0d\u5f53\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06\u7ba1\u7406\u5458\u7528\u6237\u7684\u79c1\u6709\u4e3b\u9898\u5143\u6570\u636e\u6cc4\u9732\u7ed9\u7248\u4e3b\u7528\u6237\uff0c\u5373\u4f7f\u7248\u4e3b\u65e0\u6743\u8bbf\u95ee\u8fd9\u4e9b\u79c1\u6709\u4e3b\u9898\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\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2026-17480\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Discourse Discourse \u003c2026.1.2",
      "Discourse Discourse \u003c2026.2.1",
      "Discourse Discourse \u003c2026.3.0-latest.1"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2026-27935",
  "serverity": "\u4e2d",
  "submitTime": "2026-03-24",
  "title": "Discourse\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2026-17480\uff09"
}

CVE-2026-27935 (GCVE-0-2026-27935)

Vulnerability from cvelistv5 – Published: 2026-03-19 21:33 – Updated: 2026-03-20 16:28

Title

Discourse leaks private topic metadata to non-authorized users

Summary

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Severity

6.9 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 16:28 UTC

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/discourse/discourse/security/a…	x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/c0f…	x_refsource_MISC
https://github.com/discourse/discourse/commit/d8d…	x_refsource_MISC
https://github.com/discourse/discourse/commit/f37…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
discourse	discourse	Affected: >= 2026.1.0-latest, < 2026.1.2 Affected: >= 2026.2.0-latest, < 2026.2.1 Affected: = 2026.3.0-latest

Show details on NVD website

JSON

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  "containers": {
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        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-27935",
                "options": [
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-20T16:28:24.162633Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "lang": "en",
          "value": "Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available."
        }
      ],
      "metrics": [
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            "baseSeverity": "MEDIUM",
            "privilegesRequired": "HIGH",
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            "subConfidentialityImpact": "NONE",
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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.

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.