Vulnerability · Published Aug 7, 2026 · Assigned by postiz
CVE-2026-19264Unauthenticated arbitrary file read via /uploads path traversal (URL-encoded separators) leading to instance takeover
Critical 9.8
In plain English
A critical-severity path traversal in postiz-app from gitroomhq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
Postiz is an open-source social media scheduling tool. The route that serves locally stored media joins URL-supplied path segments onto the upload directory and streams the file without normalising the path or confining it to that directory, and the route requires no authentication. Raw dot-segments are collapsed before routing, but URL-encoded separators survive route matching and are decoded only once they reach the handler, restoring the traversal at the filesystem call. An unauthenticated remote attacker can therefore read any file readable by the application process, including the process environment, which exposes the JWT signing secret, the database connection string, and connected provider and billing secrets. Because session tokens are signed with that secret and carry no expiry, this allows forging a non-expiring session as any user, including an administrator, without a password.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gitroomhq | postiz-app | 0 – before 2.22.1 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H