CVE-2026-45378

HIGHPre-NVD 7.57.5
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Decidim: Verification documents can be downloaded through reusable links

Description

Scanned identity-document images provided by participants and shown in the verification admin workflow are exposed through signed /rails/active_storage/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 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.

Reproduction steps:

  • Create a fresh verification document as a normal user.
1.1. Open http://localhost:3001/users/sign_in. 1.2. Open http://localhost:3001/id_documents/authorizations/new. 1.3. Submit an id_documents verification request with an image attachment.
  • Open the admin review page that renders the attachment.
2.1. Sign out. 2.2. Sign back in as [email protected]. 2.3. Try http://localhost:3001/admin/id_documents.
  • Harvest the signed Active Storage URL.
3.1. Open DevTools Network before loading the review page. 3.2. Reload the page. 3.3. Copy one request URL matching http://localhost:3001/rails/active_storage/disk//.
  • Replay the file URL without any Decidim session.
4.1. Open a private window or a second browser where you are not signed in to Decidim. 4.2. Paste the exact copied /rails/active_storage/disk/... URL. 4.3. Confirm the verification image still loads.

Impact

  • This only applies to Organizations using the "Identity documents" verification
  • Any party that obtains one of these URLs can download the underlying scanned identity document for the lifetime of the signed link without needing to authenticate as the reviewing admin.
  • In the reproduced case, that replay window was about seven days, which is long enough for routine leakage channels such as copied links, screenshots, logs, browser history, and support workflows to become realistic exfiltration paths.
  • This raises the risk of leakage through browser history, screenshots, copy-paste, support tickets, logs, analytics tooling, malicious browser extensions, or any other channel that captures full URLs.
  • Because the affected files are identity-verification documents, the exposed data can include highly sensitive personal information.

Patches

See https://github.com/decidim/decidim/pull/16680

Workarounds

Disable the "Identity documents" verification

Reference

OWASP A01:2021 Broken Access Control

Credits

This issue was discovered in a security audit organized by the Decidim Association and made by Radically Open Security against Decidim financed by NGI.

CVSS v3
7.5
EG Score
7.5(low)
EPSS
—
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

Vendor Advisories for CVE-2026-45378(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 17:51 UTCEG score recompute
  2. 2026-07-15 05:56 UTCEG score recompute
  3. 2026-07-14 18:00 UTCEG score recompute
  4. 2026-07-14 06:05 UTCEG score recompute
  5. 2026-07-13 18:08 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-45378?
CVE-2026-45378 is a high vulnerability published on July 13, 2026. Decidim: Verification documents can be downloaded through reusable links Description Scanned identity-document images provided by participants and shown in the verification admin workflow are exposed through signed /rails/active_storage/disk/ URLs that can be fetched without any authenticated…
When was CVE-2026-45378 disclosed?
CVE-2026-45378 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-45378?
CVE-2026-45378 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-45378?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45378, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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