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CVE-2026-45378— Decidim: Verification documents can be downloaded through reusable links

Quick assessment

Affected
decidim decidim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Decidim是Decidim组织开源的一个参与式民主框架,用 Ruby on Rails 编写。 Decidim 0.30.9之前版本、0.31.0至0.31.5之前版本和0.32.0.rc1至0.32.0.rc2之前版本存在信息泄露漏洞，该漏洞源于身份文档验证管理UI通过可重用的签名Active Storage磁盘URL嵌入验证附件，且未通过授权检查控制器，导致任何人获取URL后可在签名有效期内无需认证下载扫描文档，造成信息泄露。

CVSS 7.5 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
decidim decidim < 0.30.9 affected
>= 0.31.0.rc1, < 0.31.5 affected
>= 0.32.0.rc1, < 0.32.0 affected
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I. Basic Information for CVE-2026-45378

Vulnerability Information
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Vulnerability Title
Decidim: Verification documents can be downloaded through reusable links
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Decidim 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Decidim是Decidim组织开源的一个参与式民主框架,用 Ruby on Rails 编写。 Decidim 0.30.9之前版本、0.31.0至0.31.5之前版本和0.32.0.rc1至0.32.0.rc2之前版本存在信息泄露漏洞，该漏洞源于身份文档验证管理UI通过可重用的签名Active Storage磁盘URL嵌入验证附件，且未通过授权检查控制器，导致任何人获取URL后可在签名有效期内无需认证下载扫描文档，造成信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
decidim decidim < 0.30.9 -

II. Public POCs for CVE-2026-45378

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III. Intelligence Information for CVE-2026-45378

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Vendor Advisories for CVE-2026-45378 (1)

Same Patch Batch · decidim · 2026-08-06 · 5 CVEs total

CVE-2026-45414 8.5 HIGH Decidim: JWT-backed authentication can be replayed across organizations
CVE-2026-45573 6.4 MEDIUM Decidim: Push subscriptions can be abused for server-side requests
CVE-2026-45415 6.0 MEDIUM Decidim: CSV census record endpoints improper authorization
CVE-2026-45572 4.8 MEDIUM Decidim: HTML content blocks allow stored script execution

IV. Related Vulnerabilities

Same product: decidim
Same vendor: decidim
Same weakness: CWE-200

V. Comments for CVE-2026-45378

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