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CVE-2026-40896— OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup

Quick assessment

Affected
opf openproject
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.

OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.3.0之前版本存在安全漏洞，该漏洞源于拥有manage_agendas权限的用户可以向任意项目的会议中注入议程项，可能导致权限滥用。

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40896

Vulnerability Information
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Vulnerability Title
OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup
Source: CVE Program / CVE List V5
Vulnerability Description
OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
OpenProject 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.3.0之前版本存在安全漏洞，该漏洞源于拥有manage_agendas权限的用户可以向任意项目的会议中注入议程项，可能导致权限滥用。
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
opf openproject < 17.3.0 -

II. Public POCs for CVE-2026-40896

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III. Intelligence Information for CVE-2026-40896

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Patches & Fixes for CVE-2026-40896 (1)

Vendor Advisories for CVE-2026-40896 (1)

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-367

V. Comments for CVE-2026-40896

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