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Vulnerability · Published Aug 6, 2026 · Assigned by GitHub_M

CVE-2026-45573Decidim: Push subscriptions can be abused for server-side requests

Medium 6.4

In plain English

A medium-severity server-side request forgery in decidim from decidim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 82.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Decidim is a participatory democracy framework. Prior to 0.30.9, from 0.31.0 before 0.31.5, and in 0.32.0.rc1 before 0.32.0.rc2, when VAPID delivery is enabled, the notification subscription flow stores a client-supplied push endpoint without validating that it belongs to an approved push service, and SendPushNotification later passes that endpoint to WebPush.payload_send, allowing an authenticated user to create stored, mostly blind server-side requests to arbitrary reachable HTTPS endpoints. This issue is fixed in versions 0.30.9, 0.31.5, and 0.32.0.rc2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
RubyGemsdecidim-core0.30.9GHSA-2g9c-vf8h-prxx
RubyGemsdecidim-core0.31.5GHSA-2g9c-vf8h-prxx
RubyGemsdecidim-core0.32.0GHSA-2g9c-vf8h-prxx

Affected products (as reported)

VendorProductVersions
decidim decidim < 0.30.9>= 0.31.0.rc1, < 0.31.5>= 0.32.0.rc1, < 0.32.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References