CVE-2026-24775
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H
Lifecycle Timeline
3Description
OpenProject is an open-source, web-based project management software. In the new editor for collaborative documents based on BlockNote, OpenProject maintainers added a custom extension in OpenProject version 17.0.0 that allows to mention OpenProject work packages in the document. To show work package details, the editor loads details about the work package via the OpenProject API. For this API call, the extension to the BlockNote editor did not properly validate the given work package ID to be only a number. This allowed an attacker to generate a document with relative links that upon opening could make arbitrary `GET` requests to any URL within the OpenProject instance. This issue was patched in version version 0.0.22 of op-blocknote-extensions, which was shipped with OpenProject 17.0.2. If users cannot update immediately to version 17.0.2 of OpenProject, administrators can disable collaborative document editing in Settings -> Documents -> Real time collaboration -> Disable.
Analysis
Insufficient input validation in OpenProject's BlockNote editor extension allows authenticated users to craft malicious documents containing relative links that trigger arbitrary GET requests to any URL within the OpenProject instance when opened. An attacker with document creation privileges can exploit this to access sensitive information or perform unauthorized actions on behalf of other users. …
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Remediation
Within 30 days: Identify affected systems running OpenProject and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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