Decidim: Private exports can be downloaded through reusable links

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45377
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 23:17:24 UTC
Updated2026-08-01 00:17:16 UTC
DescriptionDecidim 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 0.002740000 probability, percentile 0.196120000 (date 2026-08-01)

Problem Types: CWE-200 | CWE-284 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decidim Decidim affected < 0.30.9 Not specified
CNA Decidim Decidim affected >= 0.31.0.rc1, < 0.31.5 Not specified
CNA Decidim Decidim affected >= 0.32.0.rc1, < 0.32.0 Not specified

References

ReferenceSourceLinkTags
github.com/decidim/decidim/security/advisories/GHSA-767h-63j4-5226 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/decidim/decidim/pull/16680 [email protected] github.com
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