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GHSA-86fh-w43w-338c

MediumCVSS 4.9 / 10
Published Jul 13, 2026·Last modified Jul 13, 2026
Affected Components(0)

No affected components available

Description

Description

The verification admin mutation flow allows accessing, verifying, and rejecting participants records from another tenant.

Technical description

The verification admin controllers loads pending_authorization_id with a raw Authorization.find(...) and then authorizes the record without checking whether it belongs to current_organization.

Reproduction steps:

  1. An org2 participant uploads their ID:
<img width="2184" height="1288" alt="decidim-verification-01" src="https://github.com/user-attachments/assets/c6713454-c787-4795-b852-3c2c672358d6" />
  1. An admin from another organisation, in this case org1, is able to open the ID from org2 by opening request 35, e.g http://localhost:3001/admin/id_documents/pending_authorizations/35/confirmations/new
<img width="1539" height="1037" alt="decidim-verification-02" src="https://github.com/user-attachments/assets/6ed646de-a501-4964-8467-013ada55ce2d" />
  1. The admin then approves this request by looking up the ID in the picture (not shown in this image, but a real ID would expose this)
<img width="1542" height="652" alt="decidim-verification-03" src="https://github.com/user-attachments/assets/c7ee5bea-3fa2-43d9-8330-8d834f34a9af" />
  1. Now the request has been approved, which can be seen from the org2 participant authorizations page:
<img width="2279" height="720" alt="decidim-verification-04" src="https://github.com/user-attachments/assets/55ee1bab-d396-4e0f-803f-21dc31a2c125" />

Impact

A tenant admin can access, reject or approve another tenant's id_documents requests.

Patches

See https://github.com/decidim/decidim/pull/16666

Workarounds

Disable the "Identity documents" verification

Reference

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.

Risk Scores
Base Score
4.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
4.5

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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