What is the CVSS score of CVE-2026-48799?

CVE-2026-48799 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N. EPSS exploitation probability: 0.2%.

Which versions of Postiz App are affected by CVE-2026-48799?

Postiz self-hosted social media scheduler versions before 2.21.8 contain a flaw in payment verification that allows users to fraudulently assign lifetime premium subscriptions without payment,…. A patch is available.

How to fix or mitigate CVE-2026-48799?

Within 24 hours, inventory all Postiz self-hosted deployments and identify which instances have payment processing enabled, then verify that no unauthorized PRO grants have occurred. Within 7 days, plan upgrades to Postiz version 2.21.8 or later and begin implementation on non-production instances to validate compatibility. Within 30 days, complete upgrades to all instances, restore payment functionality through alternative payment providers if necessary, and conduct a full audit of subscription activity logs for any fraudulent grants during the vulnerability window.

Postiz App CVE-2026-48799

EUVD-2026-44712 HIGH

Insufficient Verification of Data Authenticity (CWE-345)

2026-07-15 GitHub_M

Information Disclosure Postiz App Gitroomhq

7.7

CVSS 3.1 · Vendor: GitHub_M

Severity by source

Vendor (GitHub_M) PRIMARY

7.7 HIGH

AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Primary rating from Vendor (GitHub_M) · only source for this CVE.

CVSS VectorVendor: GitHub_M

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Patch available

Jul 15, 2026 - 21:18 EUVD

Source Code Evidence Fetched

Jul 15, 2026 - 16:46 vuln.today

Analysis Generated

Jul 15, 2026 - 16:46 vuln.today

CVE Published

Jul 15, 2026 - 16:11 cve.org

HIGH 7.7

DescriptionCVE.org

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.

AnalysisAI

Business-logic authentication bypass in Postiz self-hosted AI social media scheduler (gitroomhq/postiz-app) before 2.21.8 lets a low-privileged authenticated user grant any organization a lifetime PRO subscription without paying. The Nowpayments IPN (Instant Payment Notification) callback handler never validated the provider's shared-secret signature and trusted the subscription/organization identifier straight from the request body, so an attacker could forge a payment-confirmation callback. No public exploit identified at time of analysis and the issue is not in CISA KEV; it was privately reported and fixed by removing the crypto-payment code path entirely.