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CVE-2026-91156— Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users

一分钟漏洞结论

影响对象
discourse discourse
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, MessageBus audience calculation could deliver messages from a read-restricted category chat channel to an authenticated user who could view the category but w

CVSS 7.5 · High

影响版本矩阵 4

厂商产品 版本范围状态
discourse discourse < 2026.1.9 affected
>= 2026.7.0-latest, < 2026.7.3 affected
>= 2026.8.0-latest, < 2026.8.1 affected
>= 2026.9.0-latest, < 2026.9.0 affected
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一、 漏洞 CVE-2026-91156 基础信息

漏洞信息

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Vulnerability Title
Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users
来源: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, MessageBus audience calculation could deliver messages from a read-restricted category chat channel to an authenticated user who could view the category but was not allowed to use Chat under the site's group restrictions. The publication path bounded events by category visibility without also enforcing Chat eligibility, exposing live and recent message content available in the MessageBus backlog. The issue does not permit retrieval of the channel's full history through the Chat API and does not permit message creation or modification. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
discourse discourse < 2026.1.9 -

二、漏洞 CVE-2026-91156 的公开POC

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三、漏洞 CVE-2026-91156 的情报信息

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CVE-2026-91156 补丁与修复 (4)

同批安全公告 · discourse · 2026-10-14 · 共 3 条

CVE-2026-91159 7.7 HIGH Discourse: Stored oEmbed HTML injection via allowed iframe
CVE-2026-91157 7.5 HIGH Discourse: Media uploads remain publicly accessible after category permissions are restric

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-91156

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