What’s Vulnerable › Vulnerabilities

CVE-2026-48799: Postiz: Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-345

Description

Postiz is an AI social media scheduling tool. Prior to 2.21.8, Postiz fails to verify Nowpayments IPN callback authenticity against the payment provider shared secret and reads the target subscription identifier from the untrusted request body, allowing a low-privileged account to grant arbitrary organizations lifetime PRO subscriptions without payment. This issue is fixed in version 2.21.8.

Affected products

• gitroomhq postiz-app: before 2.21.8

References

• https://gadvisory.org/advisories/PSA-2026-Q3TCPK
• https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05
• https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8
• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j7rp-5mgj-qgg9

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