Possible CSRF attack at questionnaire templates preview

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.5 · CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

EPSS

• CVE-2023-47635: 0.31% estimated exploitation activity in the next 30 days; percentile 24.28 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact The CSRF authenticity token check is currently disabled for the questionnaire templates preview as per: https://github.com/decidim/decidim/blob/3187bdfd40ea1c57c2c12512b09a7fec0b2bed08/decidim-templates/app/controllers/decidim/templates/admin/questionnairetemplatescontroller.rb#L11 This was introduced by this commit in the PR that introduced this feature (#6247): https://github.com/decidim/decidim/pull/6247/commits/5542227be66e3b6d7530f5b536069bce09376660 The issue does not imply a serious security thread as you need to have access also to the session cookie in order to see this resource. This URL does not allow modifying the resource but it may allow attackers to gain access to information which was not meant to be public. Patches #11743 Workarounds Disable the templates functionality or remove all available templates. References #11743

Published by the source

20 Feb 2024, 18:03 UTC

Last modified by the source

20 Mar 2026, 05:03 UTC

Source last checked

26 Oct 2026, 15:51 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-f3qm-vfc3-jg6v

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# Patch Next advisory brief: CVE-2023-47635

Advisory: Possible CSRF attack at questionnaire templates preview
IDs: CVE-2023-47635, GHSA-f3qm-vfc3-jg6v
Record: https://patchnext.com/advisories/cve-2023-47635 (revision 1, source checked 26 Oct 2026, 15:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: decidim-templates 0.27.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems decidim-templates: affected >= 0.23.0, < 0.27.5; fixed in 0.27.5

## Suggested inspection (read-only)
- RubyGems decidim-templates: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on decidim-templates.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f3qm-vfc3-jg6v (GitHub-reviewed advisory GHSA-f3qm-vfc3-jg6v lists affected ranges: RubyGems decidim-templates >=0.23.0 <0.27.5)

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