CVE-2026-34576 Details
Description
Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the POST /public/v1/upload-from-url endpoint accepts a user-supplied URL and fetches it server-side using axios.get() with no SSRF protections. The only validation is a file extension check (.png, .jpg, etc.) which is trivially bypassed by appending an image extension to any URL path. An authenticated API user can fetch internal network resources, cloud instance metadata, and other internal services, with the response data uploaded to storage and returned to the attacker. This issue has been patched in version 2.21.3.
A server-side request forgery (SSRF) vulnerability has been identified in Postiz, an AI social media scheduling tool, prior to version 2.21.3. The issue arises in the POST /public/v1/upload-from-url endpoint, which accepts user-supplied URLs and fetches them server-side using axios.get(), lacking proper SSRF protections. The only validation implemented is a file extension check for image formats, which can be easily bypassed. This vulnerability allows authenticated API users to access internal network resources, cloud instance metadata, and other internal services. The fetched data is uploaded to storage and returned to the user. The vulnerability has been patched in version 2.21.3.
Users are advised to upgrade to Postiz version 2.21.3 or later. For developers, it is recommended to apply the existing IsSafeWebhookUrl validator or equivalent SSRF protection to the UploadDto, and to enforce scheme validation and DNS resolution checks to prevent DNS rebinding attacks.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3 | [email protected] | ProductRelease Notes |
| https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-89vp-m2qw-7v34 | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| gitroom postiz | < 2.21.3 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 7, 2026 | Initial Analysis | [email protected] |
| Apr 2, 2026 | New CVE Received | [email protected] |