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CVE-2026-55704— Discourse: Shared-draft titles and excerpts leak through group post serialization

Quick assessment

Affected
discourse discourse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Discourse是Discourse社区开源的一个集成人工智能技术的论坛社区平台。 Discourse 2026.1.6之前版本、2026.5.2之前版本、2026.6.1之前版本和2026.7.0之前版本存在授权问题漏洞，该漏洞源于权限验证不当，导致未被授权查看共享草稿的用户通过群组帖子和群组提及端点获取共享草稿条目，造成未发布草稿材料的信息泄露。

CVSS 4.3 · Medium EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse < 2026.1.6 affected
>= 2026.5.0-latest, < 2026.5.2 affected
>= 2026.6.0-latest, < 2026.6.1 affected
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I. Basic Information for CVE-2026-55704

Vulnerability Information
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Vulnerability Title
Discourse: Shared-draft titles and excerpts leak through group post serialization
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior o 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, users who were allowed to view a group’s activity, but were not permitted to see shared drafts, could still receive shared-draft entries through the group posts and group mentions endpoints. This could disclose shared-draft topic titles and post excerpt/content, resulting in an information disclosure of unpublished draft material. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse社区开源的一个集成人工智能技术的论坛社区平台。 Discourse 2026.1.6之前版本、2026.5.2之前版本、2026.6.1之前版本和2026.7.0之前版本存在授权问题漏洞，该漏洞源于权限验证不当，导致未被授权查看共享草稿的用户通过群组帖子和群组提及端点获取共享草稿条目，造成未发布草稿材料的信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse < 2026.1.6 -

II. Public POCs for CVE-2026-55704

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III. Intelligence Information for CVE-2026-55704

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Vendor Advisories for CVE-2026-55704 (1)

Same Patch Batch · discourse · 2026-08-17 · 4 CVEs total

CVE-2026-55674 9.3 CRITICAL Discourse: Cache poisoning/XSS via color scheme cookies
CVE-2026-53960 5.3 MEDIUM Discourse: Hidden first-post excerpt is emitted in Q&A schema JSON-LD
CVE-2026-59829 4.3 MEDIUM Discourse: Review queue exposes flag-related private message excerpts to category group mo

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-862

V. Comments for CVE-2026-55704

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