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CVE-2026-44785— Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

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存在信息泄露漏洞，该漏洞源于AI“解释”功能仅检查被解释帖子的可访问性而未检查其回复父帖，可能导致已认证用户通过“解释”功能读取隐藏父帖的原始内容。以下版本受到影响：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。

CVSS 4.3 · Medium EPSS 0.32% · P23

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-2026-44785

Vulnerability Information
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Vulnerability Title
Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts
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, the AI "explain" helper only checks can_see? on the post being explained, not its reply_to_post, so any authenticated user with access to the AI helper could read the raw contents of a hidden parent post by invoking "Explain" on a reply to it. 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:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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存在信息泄露漏洞，该漏洞源于AI“解释”功能仅检查被解释帖子的可访问性而未检查其回复父帖，可能导致已认证用户通过“解释”功能读取隐藏父帖的原始内容。以下版本受到影响：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。
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-2026-44785

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III. Intelligence Information for CVE-2026-44785

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Vendor Advisories for CVE-2026-44785 (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-2026-45085 5.3 MEDIUM Discourse: Chat misauthorization and information disclosure
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

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-200

V. Comments for CVE-2026-44785

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