Decidim up to 0.30.8/0.31.4/0.31.x Download Your Data DownloadYourDataController#download_file redirect

Summaryinfo

A vulnerability identified as problematic has been detected in Decidim up to 0.30.8/0.31.4/0.31.x. This impacts the function Decidim::DownloadYourDataController#download_file of the component Download Your Data. The manipulation leads to redirect. This vulnerability is listed as CVE-2026-45377. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Decidim up to 0.30.8/0.31.4/0.31.x. It has been rated as problematic. This issue affects the function Decidim::DownloadYourDataController#download_file of the component Download Your Data. The manipulation with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. The summary by CVE is:

Decidim is a participatory democracy framework. Prior to 0.30.9, from 0.31.0 before 0.31.5, and in 0.32.0.rc1 before 0.32.0.rc2, the normal download_your_data flow requires the requester to be logged in as the export owner, but the resulting Active Storage blob redirect URL can be replayed without authentication by anyone who obtains it. This is because Decidim::DownloadYourDataController#download_file authenticates the export owner but redirects to a signed Active Storage blob URL that is no longer bound to the owner session. This issue is fixed in versions 0.30.9, 0.31.5, and 0.32.0.rc2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-45377 since 05/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 0.30.9, 0.31.5 or 0.32.0.rc2 eliminates this vulnerability.

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Productinfo

Name

• Decidim

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.30.0
• 0.30.1
• 0.30.2
• 0.30.3
• 0.30.4
• 0.30.5
• 0.30.6
• 0.30.7
• 0.30.8
• 0.31
• 0.31.0
• 0.31.1
• 0.31.2
• 0.31.3
• 0.31.4

Website

• Product: https://github.com/decidim/decidim/

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