CVE-2026-34576 describes a Server-Side Request Forgery (SSRF) vulnerability in the Postiz AI social media scheduling tool, affecting versions prior to 2.21.3. An authenticated API user can exploit the /public/v1/upload-from-url endpoint by trivially bypassing a file extension check, enabling the fetching of internal network resources and cloud instance metadata. This high-severity issue (CVSS 8.3) has low attack complexity and a high potential for sensitive information disclosure. Currently, there is no evidence of active exploitation, public exploit code, or significant community attention. The vulnerability has been patched in Postiz version 2.21.3.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.21.3CPE matchmatch criteria | cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.