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CVE-2026-34590— Postiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation

Quick assessment

Affected
gitroomhq postiz-app
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.

Gitroom Postiz是Gitroom开源的一个社交媒体日程安排工具。 Gitroom Postiz 2.21.4之前版本存在代码问题漏洞，该漏洞源于创建Webhook的POST /webhooks/端点缺少阻止内部/私有网络地址的验证器，可能导致针对内部服务的盲服务端请求伪造攻击。

CVSS 5.4 · Medium EPSS 0.33% · P24
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I. Basic Information for CVE-2026-34590

Vulnerability Information
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Vulnerability Title
Postiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation
Source: CVE Program / CVE List V5
Vulnerability Description
Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creating webhooks uses WebhooksDto which validates the url field with only @IsUrl() (format check), missing the @IsSafeWebhookUrl validator that blocks internal/private network addresses. The update (PUT /webhooks/) and test (POST /webhooks/send) endpoints correctly apply @IsSafeWebhookUrl. When a post is published, the orchestrator fetches the stored webhook URL without runtime validation, enabling blind SSRF against internal services. This issue has been patched in version 2.21.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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
Gitroom Postiz 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gitroom Postiz是Gitroom开源的一个社交媒体日程安排工具。 Gitroom Postiz 2.21.4之前版本存在代码问题漏洞，该漏洞源于创建Webhook的POST /webhooks/端点缺少阻止内部/私有网络地址的验证器，可能导致针对内部服务的盲服务端请求伪造攻击。
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
gitroomhq postiz-app < 2.21.4 -

II. Public POCs for CVE-2026-34590

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III. Intelligence Information for CVE-2026-34590

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Patches & Fixes for CVE-2026-34590 (1)

Vendor Advisories for CVE-2026-34590 (1)

Other References for CVE-2026-34590 (1)

Same Patch Batch · gitroomhq · 2026-04-02 · 3 CVEs total

CVE-2026-34577 8.6 HIGH Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassab
CVE-2026-34576 Postiz: SSRF in upload-from-url endpoint allows fetching internal resources and cloud meta

IV. Related Vulnerabilities

Same product: postiz-app
Same vendor: gitroomhq
Same weakness: CWE-918

V. Comments for CVE-2026-34590

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