Vulnerability · Published Jul 31, 2026 · Assigned by GitHub_M

CVE-2026-45377Decidim: Private exports can be downloaded through reusable links

Medium 6.5

In plain English

A medium-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 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 60.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
RubyGems	decidim-core	0.30.9	GHSA-767h-63j4-5226
RubyGems	decidim-core	0.31.5	GHSA-767h-63j4-5226
RubyGems	decidim-core	0.32.0	GHSA-767h-63j4-5226

Affected products (as reported)

Vendor	Product	Versions
decidim	decidim	< 0.30.9>= 0.31.0.rc1, < 0.31.5>= 0.32.0.rc1, < 0.32.0

Weakness: CWE-200, CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

https://github.com/decidim/decidim/security/advisories/GHSA-767h-63j4-5226 x_refsource_CONFIRM
https://github.com/decidim/decidim/pull/16680 x_refsource_MISC