GHSA-r3v7-5x4c-c69q

Suggest an improvement
Source
https://github.com/advisories/GHSA-r3v7-5x4c-c69q
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-r3v7-5x4c-c69q/GHSA-r3v7-5x4c-c69q.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-r3v7-5x4c-c69q
Aliases
Published
2026-07-13T17:16:56Z
Modified
2026-07-13T17:41:46Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CVSS Calculator
Summary
Decidim: JWT-backed authentication can be replayed across organizations
Details

Description

A JWT issued to an Org 1 account is accepted on the Org 2 API and can read the admin-only GraphQL participantDetails field for an Org 2 participant. The same trust-boundary problem also affects API-user authentication: an Org 1 API user can use a JWT on the Org 1 host and replay that JWT to the Org 2 API to read Org 2 participant personal data and reach Org 2's proposal.answer mutation path.

Technical description

The current host selects the Decidim organization context, but JWT-backed API authentication is not sufficiently bound to that host organization. As a result, the API can process a request in Org 2's context while still trusting an authenticated principal from Org 1.

Reproduction steps:

  1. Use an API key provided by the system administrator that is assigned to organization 1 to create the JWT token or get the JWT token shown in the response when logged in as the organization admin.
decidim-jwt-01
  1. When using this JWT token it is possible to retrieve details from other organisations. Notice the change of the host header in the request below to that of another tenant org2.localhost:3001
decidim-jwt-02

Note that using a participant-generated JWT did not allow showing these results.

Impact

A JWT issued for one organization can be replayed successfully against another organization's API and used to retrieve sensitive details from that organization.

Patches

See https://github.com/decidim/decidim/pull/16673 and https://github.com/decidim/decidim/pull/16756

Workarounds

Disable JWT credentials on system panel (/system)

References

OWASP A01:2021 Broken Access Control

Credits

This issue was discovered in a security audit organized by the Decidim Association and made by Radically Open Security against Decidim financed by NGI.

Database specific 
{
    "cwe_ids":  [
        "CWE-287"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-13T17:16:56Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}
References

Affected packages

RubyGems / decidim

Package

Name
decidim
Purl
pkg:gem/decidim

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.31.5

Affected versions

0.*
0.0.1.alpha1
0.0.1.alpha2
0.0.1.alpha3
0.0.1.alpha4
0.0.1.alpha5
0.0.1.alpha6
0.0.1.alpha7
0.0.1.alpha8
0.0.1.alpha9
0.0.1
0.0.2
0.0.3
0.0.4
0.0.5
0.0.6
0.0.7
0.0.8.1
0.1.0
0.2.0
0.3.0
0.3.1
0.3.2
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.5.0
0.5.1
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.6.8
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.9.0
0.9.1
0.9.2
0.9.3
0.10.0
0.10.1
0.11.0.pre1
0.11.1
0.11.2
0.12.0.pre
0.12.0
0.12.1
0.12.2
0.13.0.pre1
0.13.0
0.13.1
0.14.1
0.14.2
0.14.3
0.14.4
0.15.0
0.15.1
0.15.2
0.16.0
0.16.1
0.17.0
0.17.1
0.17.2
0.18.0
0.18.1
0.19.0
0.19.1
0.20.0
0.20.1
0.21.0
0.22.0
0.23.0
0.23.1.rc1
0.23.1
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.24.0.rc1
0.24.0.rc2
0.24.0
0.24.1
0.24.2
0.24.3
0.25.0.rc1
0.25.0.rc2
0.25.0.rc3
0.25.0.rc4
0.25.0
0.25.1
0.25.2
0.26.0.rc2
0.26.0
0.26.1
0.26.2
0.26.3
0.26.4
0.26.5
0.26.7
0.26.8
0.26.9
0.26.10
0.27.0.rc1
0.27.0.rc2
0.27.0
0.27.1
0.27.2
0.27.3
0.27.4
0.27.5
0.27.6
0.27.7
0.27.8
0.27.9
0.27.10
0.28.0.rc4
0.28.0.rc5
0.28.0
0.28.1
0.28.2
0.28.3
0.28.4
0.28.5
0.28.6
0.29.0.rc1
0.29.0.rc2
0.29.0.rc3
0.29.0.rc4
0.29.0
0.29.1
0.29.2
0.29.3
0.29.4
0.29.5
0.29.6
0.29.7
0.30.0.rc1
0.30.0.rc2
0.30.0.rc3
0.30.0
0.30.1
0.30.2
0.30.3
0.30.4
0.30.5
0.30.6
0.30.7
0.30.8
0.30.9
0.31.0.rc1
0.31.0.rc2
0.31.0
0.31.1
0.31.2
0.31.3
0.31.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-r3v7-5x4c-c69q/GHSA-r3v7-5x4c-c69q.json"

RubyGems / decidim

Package

Name
decidim
Purl
pkg:gem/decidim

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0.32.0.rc1
Fixed
0.32.0

Affected versions

0.*
0.32.0.rc1
0.32.0.rc2
0.32.0.rc3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-r3v7-5x4c-c69q/GHSA-r3v7-5x4c-c69q.json"