Vulnerability · Published Aug 6, 2026 · Assigned by GitHub_M
CVE-2026-45378Decidim: Verification documents can be downloaded through reusable links
High 7.5
In plain English
A high-severity information exposure in decidim from decidim. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 identity-document verification admin UI embeds verification_attachment blobs through reusable signed Active Storage disk URLs, allowing anyone who obtains a URL to download the scanned document without an authenticated Decidim session until the signature expires. Verification-document images are rendered with variant_url(...), which produces signed /rails/active_storage/disk/... links instead of routing the file through an authorization-checking controller. Because Decidim configures Active Storage service URLs to remain valid for seven days, the URL itself becomes the credential for that period. The affected files are verification_attachment blobs on Decidim::Authorization, and the admin review pages embed those signed URLs directly into the HTML for pending and confirmation views. This issue is fixed in versions 0.30.9, 0.31.5, and 0.32.0.rc2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| RubyGems | decidim-verifications | 0.30.9 | GHSA-3mvf-82qp-8qh5 |
| RubyGems | decidim-verifications | 0.31.5 | GHSA-3mvf-82qp-8qh5 |
| RubyGems | decidim-verifications | 0.32.0 | GHSA-3mvf-82qp-8qh5 |
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/decidim/decidim/security/advisories/GHSA-3mvf-82qp-8qh5 x_refsource_CONFIRM