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CVE-2026-59829— Discourse: Review queue exposes flag-related private message excerpts to category group moderators

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2026.7.1之前版本存在授权问题漏洞，该漏洞源于权限验证不当，导致在启用分类组审核的站点上，审查队列可能包含附加到标记的私信摘录（及永久链接），分类组版主能够读取其未经授权看到的标记讨论内容，造成私信摘录信息泄露。

CVSS 4.3 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse >= 2026.1.0-latest, < 2026.1.6 affected
>= 2026.5.0-latest, < 2026.5.2 affected
< 2026.6.1 affected
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I. Basic Information for CVE-2026-59829

Vulnerability Information
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Vulnerability Title
Discourse: Review queue exposes flag-related private message excerpts to category group moderators
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt (and permalink) of the private message attached to a flag, even when the reviewing category moderator was not a participant in that message. These notify_moderators flag messages are addressed only to moderators and, for core flags, to a category's moderation groups as they existed when the flag was raised, so a category group moderator could read flag-discussion content they were not authorized to see. This affects official plugins that create such messages and core flags raised before a moderator's group was granted moderation of the category. Only the confidentiality of a limited excerpt of these flag-related private messages is affected; no content can be modified or deleted. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1.
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2026.7.1之前版本存在授权问题漏洞，该漏洞源于权限验证不当，导致在启用分类组审核的站点上，审查队列可能包含附加到标记的私信摘录（及永久链接），分类组版主能够读取其未经授权看到的标记讨论内容，造成私信摘录信息泄露。
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 >= 2026.1.0-latest, < 2026.1.6 -

II. Public POCs for CVE-2026-59829

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III. Intelligence Information for CVE-2026-59829

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Patches & Fixes for CVE-2026-59829 (5)

Vendor Advisories for CVE-2026-59829 (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-2026-55704 4.3 MEDIUM Discourse: Shared-draft titles and excerpts leak through group post serialization

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59829

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