CVE-2026-42556

Postiz, an open-source social media scheduling tool, has a path traversal vulnerability in the route serving locally stored media. The route requires no authentication and does not normalize paths, allowing an unauthenticated attacker to read any file readable by the process, including environment variables with JWT secrets and database credentials.

Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, an attacker could exploit a vulnerability in the Skool integration to forge a SUPERADMIN session, allowing impersonation of arbitrary organizations.

Postiz, an AI social media scheduling tool, prior to commit da44801 contains a "Pwn Request" vulnerability in the Build and Publish PR Docker Image workflow. Any unauthenticated user can execute arbitrary code during the Docker build process and exfiltrate a highly privileged GITHUB_TOKEN (write-all permissions) by opening a Pull Request from a fork with a maliciously modified Dockerfile.dev.

A vulnerability in Postiz, an AI social media scheduling tool, allows a low-privileged account to grant arbitrary organizations lifetime PRO subscriptions without payment. The issue stems from missing verification of Nowpayments IPN callback authenticity and reading the subscription identifier from an untrusted request body.

Postiz is an AI social media scheduling tool. Versions prior to 2.21.8 contained an unauthenticated endpoint that accepted a signed token and applied subscription-enforcement side effects without verifying the token's intended purpose.

Postiz is an AI social media scheduling tool. In versions from 2.16.6 to 2.21.6, SSRF protections have a TOCTOU vulnerability: the isSafePublicHttpsUrl() function resolves DNS to validate the IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7.

Postiz prior to version 2.21.4 has a blind SSRF vulnerability in the POST /webhooks/ endpoint. URL validation does not block internal/private addresses, allowing attackers to make requests to internal services.

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.

Postiz before version 2.21.3 in the POST /public/v1/upload-from-url endpoint fetches user-supplied URLs without SSRF protections. File extension validation is easily bypassed. An authenticated user can read internal network resources and cloud metadata.