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CVE-2026-34577— Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check

CVSS 8.6 · High EPSS 0.11% · P30
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I. Basic Information for CVE-2026-34577

Vulnerability Information
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Vulnerability Title
Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check
Source: NVD (National Vulnerability Database)
Vulnerability Description
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
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 2.21.3之前版本存在代码问题漏洞，该漏洞源于GET /public/stream端点缺少身份验证和服务端请求伪造保护，可能导致未经身份验证的攻击者读取内部服务的响应。
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

VendorProductAffected VersionsCPESubscribe
gitroomhqpostiz-app < 2.21.3 -

II. Public POCs for CVE-2026-34577

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8365 chars
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III. Intelligence Information for CVE-2026-34577

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

CVE-2026-345905.4 MEDIUMPostiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation
CVE-2026-34576Postiz: 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-2026-34577

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