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Fencer Vulns
high 8.5

CVE-2026-45414 json

Decidim: JWT-backed authentication can be replayed across organizations

published 2026-07-13 3 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-54230 , GHSA-r3v7-5x4c-c69q

cvss
8.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • rubygems decidim 0.31.5, 0.32.0
  • decidim decidim 0.31.5, 0.32.0.rc2

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/decidim/decidim/security/advisories/GHSA-r3v7-5x4c-c69q referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
GitHub 3.1 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
rubygems decidim
<0.31.5
>=0.32.0.rc1, <0.32.0
0.31.5
0.32.0

Affected products

  • decidim decidim

Classification

Weakness
  • CWE-639 Authorization Bypass Through User-Controlled Key
  • CWE-863 Incorrect Authorization
  • CWE-287 Improper Authentication

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.