CVE-2026-48799

Postiz: Unauthenticated arbitrary lifetime PRO grant via Nowpayments webhook

State: Published
Severity: 7.7 High
Published: Jul 15, 2026
Updated: Jul 15, 2026
Reserved: May 22, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N	GitHub_M

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity
CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
postiz-appgitroomhq	< 2.21.8Affected

References

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