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CVE-2026-84302— Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables

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 是一个开源的讨论平台。在版本 2026.1.6、2026.5.2、2026.6.1 和 2026.7.0 之前，与私聊相关的 Discourse AI 审查项（reviewables）可能会出现在未参与该私聊的审核员的审查队列中。审查项可见性过滤机制未能将私聊相关审查项的限制应用于有权访问该私聊主题的受众，从而导致审核员能够查看本应保密的内容。根据可用的审查项操作权限，审核员还可能通过关闭相关主题或删除帖子等方式修改私聊内容。此漏洞的利用需要具备已认证的审核员账户以及一个已存在的、与私聊相关的

CVSS 4.2 · Medium EPSS 0.24% · P13
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I. Basic Information for CVE-2026-84302

Vulnerability Information
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Vulnerability Title
Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables
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 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. 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:H/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
discourse discourse < 2026.7.0 -

II. Public POCs for CVE-2026-84302

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III. Intelligence Information for CVE-2026-84302

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Patches & Fixes for CVE-2026-84302 (1)

Other References for CVE-2026-84302 (5)

Same Patch Batch · discourse · 2026-09-24 · 9 CVEs total

CVE-2026-91122 8.7 HIGH Discourse: Chat MessageBus delivers read-restricted messages to unauthorized users
CVE-2026-91123 7.2 HIGH Discourse: Reject literal backslash path separators in iframe src traversal guard
CVE-2026-91133 6.5 MEDIUM Discourse: Escape LIKE metacharacters in upload paths to prevent disclosure
CVE-2026-91119 6.4 MEDIUM Discourse: Encode action_code_who in mention URLs
CVE-2026-91134 5.4 MEDIUM Discourse: Block post iframes whose encoded userinfo bypasses the allowed_iframes allowlis
CVE-2026-91120 5.4 MEDIUM Discourse: Stored HTML injection in video notification emails
CVE-2026-91121 5.0 MEDIUM Discourse: Chat upload filenames rendered as raw HTML in excerpts
CVE-2026-91132 4.3 MEDIUM Discourse: Wildcard iframe origin allowlist bypass via authority separators

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-84302

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