CVE-2026-24772
Unknown Unknown - Not Provided
Authentication Token Decryption via URL Validation Flaw in OpenProject

Publication date: 2026-01-28

Last updated on: 2026-02-12

Assigner: GitHub, Inc.

Description
OpenProject is an open-source, web-based project management software. To enable the real time collaboration on documents, OpenProject 17.0 introduced a synchronization server. The OpenPrioject backend generates an authentication token that is currently valid for 24 hours, encrypts it with a shared secret only known to the synchronization server. The frontend hands this encrypted token and the backend URL over to the synchronization server to check user's ability to work on the document and perform intermittent saves while editing. The synchronization server does not properly validate the backend URL and sends a request with the decrypted authentication token to the endpoint that was given to the server. An attacker could use this vulnerability to decrypt a token that he intercepted by other means to gain an access token to interact with OpenProject on the victim's behalf. This vulnerability was introduced with OpenProject 17.0.0 and was fixed in 17.0.2. As a workaround, disable the collaboration feature via Settings -> Documents -> Real time collaboration -> Disable. Additionally the `hocuspocus` container should also be disabled.
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Meta Information
Published
2026-01-28
Last Modified
2026-02-12
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24772
EUVD
EUVD-2026-4877
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openproject openproject From 17.0.0 (inc) to 17.0.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-345 The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
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Executive Summary

This vulnerability exists in OpenProject 17.0.0 where the synchronization server does not properly validate the backend URL. The backend generates an authentication token valid for 24 hours, encrypts it, and sends it to the synchronization server along with the backend URL. The server then decrypts the token and sends a request to the given backend URL without proper validation. An attacker who intercepts an encrypted token can exploit this flaw to decrypt the token and gain an access token to interact with OpenProject as the victim.

Impact Analysis

An attacker exploiting this vulnerability can gain unauthorized access to OpenProject on behalf of a victim by decrypting intercepted authentication tokens. This can lead to unauthorized actions such as accessing, modifying, or saving documents in real time collaboration, potentially compromising sensitive project data and user accounts.

Mitigation Strategies

To mitigate this vulnerability immediately, disable the collaboration feature by navigating to Settings -> Documents -> Real time collaboration and selecting Disable. Additionally, the 'hocuspocus' container should also be disabled. Also, ensure your OpenProject version is updated to 17.0.2 or later where the vulnerability is fixed.

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