CVE-2025-65017: Decidim's private data exports can lead to data leaks

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-03 · updated 2026-06-17
Weakness: CWE-200

Description

Decidim is a participatory democracy framework. In versions from 0.30.0 to before 0.30.4 and from 0.31.0.rc1 to before 0.31.0, the private data exports can lead to data leaks in case the UUID generation, causing collisions for the generated UUIDs. This issue has been patched in versions 0.30.4 and 0.31.0.

Affected products

decidim: from 0.30.0 before 0.30.4; 0.31.0-rc1, 0.31.0-rc2 — fixed in 0.30.4

How to fix

Upgrade to a fixed version: decidim 0.30.4. Check the vendor advisory for mitigations.

References

https://github.com/decidim/decidim/pull/13571
https://github.com/decidim/decidim/releases/tag/v0.30.4
https://github.com/decidim/decidim/releases/tag/v0.31.0
https://github.com/decidim/decidim/security/advisories/GHSA-3cx6-j9j4-54mp

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