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CVE-2026-26265— Discourse has IDOR vulnerability in the directory items endpoint

Quick assessment

Affected
discourse discourse
Exploitation
Public or AI PoC available; prioritize validation
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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在安全漏洞，该漏洞源于目录项端点存在不安全的直接对象引用，可能导致任何用户（包括匿名用户）批量泄露所有用户的私有字段数据。

CVSS 7.5 · High EPSS 1.45% · P72

Public Exploits 1

Nuclei · 1 CVE-2026-26265.yaml [template]

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-26265

Vulnerability Information
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Vulnerability Title
Discourse has IDOR vulnerability in the directory items endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The `user_field_ids` parameter in `DirectoryItemsController#index` accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions (`show_on_profile` / `show_on_user_card`) that are enforced elsewhere (e.g., `UserCardSerializer` via `Guardian#allowed_user_field_ids`). An attacker can request `GET /directory_items.json?period=all&user_field_ids=<id>` with any private field ID and receive that field's value for every user in the directory response. This enables bulk exfiltration of private user data such as phone numbers, addresses, or other sensitive custom fields that admins have explicitly configured as non-public. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by filtering `user_field_ids` against `UserField.public_fields` for non-staff users before building the custom field map. As a workaround, site administrators can remove sensitive data from private user fields, or disable the user directory via the `enable_user_directory` site setting.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Discourse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Discourse是Discourse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 2025.12.2之前版本、2026.1.1之前版本和2026.2.0之前版本存在安全漏洞，该漏洞源于目录项端点存在不安全的直接对象引用，可能导致任何用户（包括匿名用户）批量泄露所有用户的私有字段数据。
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 < 2025.12.2 -

II. Public POCs for CVE-2026-26265

# POC Description Source Link Shenlong Link
1 Discourse prior to 2025.12.2, 2026.1.1, and 2026.2.0 contains an IDOR vulnerability caused by lack of authorization checks on user_field_ids parameter in DirectoryItemsController#index, letting any user retrieve private user field values, exploit requires no authentication. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-26265.yaml POC Details
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III. Intelligence Information for CVE-2026-26265

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Same Patch Batch · discourse · 2026-02-26 · 17 CVEs total

CVE-2026-26078 7.5 HIGH Discourse has authentication bypass vulnerability in the Patreon plugin webhook endpoint
CVE-2026-26077 6.5 MEDIUM Discourse doesn't ensure webhooks require a token
CVE-2026-26207 5.4 MEDIUM DIscourse's discourse-policy plugin lacks post access check
CVE-2026-26973 4.3 MEDIUM Discourse doesn't scope reviewable notes to user-visible reviewables
CVE-2026-28227 Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Tim
CVE-2026-28219 Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Bann
CVE-2026-28218 Discourse's Fail-Open Access Control in Data Explorer Plugin Allows Unauthorized SQL Query
CVE-2026-27154 Discourse has XSS when editing a malicious post
CVE-2026-27153 Discourse doesn't prevent moderators from exporting user Chat DMs
CVE-2026-27152 DIscourse has DM communication-preference bypass when adding members
CVE-2026-27162 DIscourse doesn't prevent whispers to leak in excerpts
CVE-2026-27151 Discourse doesn't validate destination topic when moving posts
CVE-2026-27150 Discourse doesn't ensure guardian check when creating QueryGroupBookmark
CVE-2026-27149 Discourse has SQL injection in PM tag filtering
CVE-2026-27021 Discourse: Poll voters endpoint lacked post visibility checks
CVE-2026-26979 Discourse: TL4 users are able to change status of restricted topics

IV. Related Vulnerabilities

Same product: discourse
Same vendor: discourse
Same weakness: CWE-863

V. Comments for CVE-2026-26265

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