CVE-2026-45414 Decidim: JWT-backed authentication can be replayed across organizations
Attackers can replay JWTs across tenants to access unauthorized participant data and proposal endpoints in Decidim.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45414?
CVE-2026-45414 is a high-severity authentication bypass vulnerability in decidim, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Decidim is a participatory democracy framework. Prior to 0.31.5 and in 0.32.0.rc1 before 0.32.0.rc2, JWT-backed API authentication is not bound to the organization selected by the current host, allowing a JWT issued for one tenant to be replayed against another tenant’s API to read participantDetails data and reach the proposal.answer mutation path. This issue is fixed in versions 0.31.5 and 0.32.0.rc2.
Which versions are affected by CVE-2026-45414?
4 open source packages ship an affected version, including decidim.
| Package | Affected | Fixed in |
|---|---|---|
decidim RubyGems | All versions | 0.31.5 |
decidim RubyGems | All versions | 0.31.5 |
decidim RubyGems | From 0.32.0.rc1 | 0.32.0 |
decidim RubyGems | From 0.32.0.rc1 | 0.32.0 |
How do I fix CVE-2026-45414?
Upgrade decidim to a fixed version for your release line: 0.31.5 or 0.32.0.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-45414 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45414 exists.
Sources
Also known as GHSA-r3v7-5x4c-c69q.