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Not in CISA KEV
HIGH severity

Decidim has broken access control in templatesGHSA-639h-86hw-qcjq

HIGH

GHSA-639h-86hw-qcjq is a high-severity (CVSS 7.1) CWE-284 vulnerability in decidim. A fix is available for decidim — see the affected versions and patch details below.

Also known asCVE-2023-36465
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-639h-86hw-qcjq.

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk+0.13%
Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk
0.00%0.39%0.78%1.17%0.1%0.7%May 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected
💎decidim💎decidim-templates💎decidim-templates💎decidim

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

Decidim is a participatory democracy framework, written in Ruby on Rails, originally developed for the Barcelona City government online and offline participation website. The templates module doesn't enforce the correct permissions, allowing any logged-in user to access to this functionality in the administration panel. An attacker could use this vulnerability to change, create or delete templates of surveys. This issue has been patched in version 0.26.8 and 0.27.4.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
💎RubyGemsdecidim≥ 0.23.2&&< 0.26.80.26.8bundle update decidim --conservative
💎RubyGemsdecidim-templates≥ 0.23.2&&< 0.26.80.26.8bundle update decidim-templates --conservative
💎RubyGemsdecidim-templates≥ 0.27.0&&< 0.27.40.27.4bundle update decidim-templates --conservative
💎RubyGemsdecidim≥ 0.27.0&&< 0.27.40.27.4bundle update decidim --conservative

Affected Products

1 product · 2 configurations
Application
decidimdecidim
≥ 0.27.0 && < 0.27.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for decidim, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update decidim to 0.26.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-639h-86hw-qcjq is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### Impact The `templates` module doesn't enforce the correct permissions, allowing any logged-in user to access to this functionality in the administration panel. An attacker could use this vulnerability to change, create or delete templates of surveys.
O3 Security · Impact-Aware SCA

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Decidim has broken access control in templates (High 7.1)