Decidim: Verification documents can be downloaded through reusable links

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-45378: 0.42% estimated exploitation activity in the next 30 days; percentile 35.91 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Description Scanned identity-document images provided by participants and shown in the verification admin workflow are exposed through signed /rails/activestorage/disk/ URLs that can be fetched without any authenticated session. Anyone who obtains one of those URLs can retrieve the document until the signature expires. Technical description This issue comes from the verification admin UI exposing scanned documents through reusable Active Storage disk links. Verification-document images are rendered with varianturl(...), which produces signed /rails/activestorage/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 verificationattachment blobs on Decidim::Authorization, and the admin review pages embed those signed URLs directly into the HTML for pending and confirmation views.…

Published by the source

13 Jul 2026, 17:10 UTC

Last modified by the source

13 Jul 2026, 17:10 UTC

Source last checked

26 Oct 2026, 15:52 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-3mvf-82qp-8qh5

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# Patch Next advisory brief: CVE-2026-45378

Advisory: Decidim: Verification documents can be downloaded through reusable links
IDs: CVE-2026-45378, GHSA-3mvf-82qp-8qh5
Record: https://patchnext.com/advisories/cve-2026-45378 (revision 1, source checked 26 Oct 2026, 15:52 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: decidim-verifications 0.32.0, 0.31.5, 0.30.9. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems decidim-verifications: affected < 0.30.9; >= 0.31.0.rc1, < 0.31.5; >= 0.32.0.rc1, < 0.32.0; fixed in 0.31.5, 0.32.0, 0.30.9

## Suggested inspection (read-only)
- RubyGems decidim-verifications: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on decidim-verifications.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-3mvf-82qp-8qh5 (GitHub-reviewed advisory GHSA-3mvf-82qp-8qh5 lists affected ranges: RubyGems decidim-verifications >=0 =0.31.0.rc1 =0.32.0.rc1 <0.32.0)

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