CVE-2026-34590
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
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.
Risk Assessment
Attackers can scan internal networks, access sensitive services, or perform attacks on internal infrastructure.
Recommendation
Update Postiz to version 2.21.4, which includes a fix that blocks internal addresses in URL validation.
Original NVD description (English source)
Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creating webhooks uses WebhooksDto which validates the url field with only @IsUrl() (format check), missing the @IsSafeWebhookUrl validator that blocks internal/private network addresses. The update (PUT /webhooks/) and test (POST /webhooks/send) endpoints correctly apply @IsSafeWebhookUrl. When a post is published, the orchestrator fetches the stored webhook URL without runtime validation, enabling blind SSRF against internal services. This issue has been patched in version 2.21.4.