Decidim up to 0.30.8/0.31.4/0.32.0.rc1 Notification Subscription Flow server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in Decidim up to 0.30.8/0.31.4/0.32.0.rc1. Affected by this vulnerability is an unknown functionality of the component Notification Subscription Flow. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-45573. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in Decidim up to 0.30.8/0.31.4/0.32.0.rc1 and classified as critical. Affected by this vulnerability is some unknown functionality of the component Notification Subscription Flow. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-45573 since 05/12/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.30.9, 0.31.5 or 0.32.0.rc2 eliminates this vulnerability.

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Productinfo

Name

• Decidim

Version

• 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
• 0.31.0
• 0.31.1
• 0.31.2
• 0.31.3
• 0.31.4
• 0.32.0.rc1

Website

• Product: https://github.com/decidim/decidim/

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