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CVE-2026-45085— Discourse: Chat misauthorization and information disclosure

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 2026.1.0-latest至2026.1.4之前版本、2026.3.0-latest至2026.3.1之前版本和2026.4.0-latest至2026.4.1之前版本存在信息泄露漏洞，该漏洞源于chat plugin中存在授权和信息泄露问题（其中一个还涉及discourse-calendar），可能导致只读类别用户创建聊天线程、自删除聊天消息在频道访问被撤销后被作者

CVSS 5.3 · Medium EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
discourse discourse >= 2026.1.0-latest, < 2026.1.4 affected
>= 2026.3.0-latest, < 2026.3.1 affected
>= 2026.4.0-latest, < 2026.4.1 affected
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I. Basic Information for CVE-2026-45085

Vulnerability Information
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Vulnerability Title
Discourse: Chat misauthorization and information disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, four authorization/disclosure issues in the chat plugin (one also involving discourse-calendar): read-only category users could create chat threads, self-deleted chat messages could be restored by their author after channel access was revoked, moderators reviewing a flagged chat message were shown the channel's current last_message (often unrelated DM content), and calendar event payloads exposed the attached chat channel and its last message to viewers without chat access (including anonymous users). This affects sites with the chat plugin enabled; the calendar issue additionally requires discourse-calendar. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse社区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 2026.1.0-latest至2026.1.4之前版本、2026.3.0-latest至2026.3.1之前版本和2026.4.0-latest至2026.4.1之前版本存在信息泄露漏洞，该漏洞源于chat plugin中存在授权和信息泄露问题（其中一个还涉及discourse-calendar），可能导致只读类别用户创建聊天线程、自删除聊天消息在频道访问被撤销后被作者
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, < 2026.1.4 -

II. Public POCs for CVE-2026-45085

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III. Intelligence Information for CVE-2026-45085

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Vendor Advisories for CVE-2026-45085 (1)

Same Patch Batch · discourse · 2026-06-12 · 11 CVEs total

CVE-2026-44786 7.5 HIGH Discourse: Public chat MessageBus broadcasts are not restricted to chat-eligible users
CVE-2026-45775 6.8 MEDIUM Discourse: Cross-site backup access via path traversal in multisite local backups
CVE-2026-44784 6.5 MEDIUM Discourse: Non-staff group owners can see email password in plaintext through group histor
CVE-2026-44783 5.4 MEDIUM Discourse: Replying to a whisper lets non-whisperers create staff-only whisper posts
CVE-2026-47264 5.3 MEDIUM Discourse: Don't leak restricted tag group names via tag info
CVE-2026-47263 4.3 MEDIUM Discourse: Prevent webhook payload disclosure on event redelivery
CVE-2026-44779 4.3 MEDIUM Discourse: Bot debug endpoints disclose whisper translation audit logs
CVE-2026-44780 4.3 MEDIUM Discourse: Category queue reviewers can read raw incoming emails from queued posts
CVE-2026-44782 4.3 MEDIUM Discourse: GroupPostSerializer leaks hidden full names through reaction post association
CVE-2026-44785 4.3 MEDIUM Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-45085

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