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

Quick assessment

Affected
decidim decidim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Decidim是Decidim组织开源的一个参与式民主框架,用 Ruby on Rails 编写。 Decidim 0.30.9之前版本、0.31.0版本至0.31.5之前版本和0.32.0.rc1版本至0.32.0.rc2之前版本存在服务端请求伪造漏洞，该漏洞源于通知订阅流程未验证客户端提供的推送端点是否属于获准的推送服务，可能导致经过身份验证的用户向任意可达HTTPS端点创建存储的服务器端请求。

CVSS 6.4 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
decidim decidim < 0.30.9 affected
>= 0.31.0.rc1, < 0.31.5 affected
>= 0.32.0.rc1, < 0.32.0 affected
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I. Basic Information for CVE-2026-45573

Vulnerability Information
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Vulnerability Title
Decidim: Push subscriptions can be abused for server-side requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Decidim 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Decidim是Decidim组织开源的一个参与式民主框架,用 Ruby on Rails 编写。 Decidim 0.30.9之前版本、0.31.0版本至0.31.5之前版本和0.32.0.rc1版本至0.32.0.rc2之前版本存在服务端请求伪造漏洞，该漏洞源于通知订阅流程未验证客户端提供的推送端点是否属于获准的推送服务，可能导致经过身份验证的用户向任意可达HTTPS端点创建存储的服务器端请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
decidim decidim < 0.30.9 -

II. Public POCs for CVE-2026-45573

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III. Intelligence Information for CVE-2026-45573

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Patches & Fixes for CVE-2026-45573 (1)

Vendor Advisories for CVE-2026-45573 (1)

Same Patch Batch · decidim · 2026-08-06 · 5 CVEs total

CVE-2026-45414 8.5 HIGH Decidim: JWT-backed authentication can be replayed across organizations
CVE-2026-45378 7.5 HIGH Decidim: Verification documents can be downloaded through reusable links
CVE-2026-45415 6.0 MEDIUM Decidim: CSV census record endpoints improper authorization
CVE-2026-45572 4.8 MEDIUM Decidim: HTML content blocks allow stored script execution

IV. Related Vulnerabilities

Same product: decidim
Same vendor: decidim
Same weakness: CWE-918

V. Comments for CVE-2026-45573

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