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%.

Postiz App CVE-2026-48799

Q: 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.

Q: 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.

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

View

Vulnerability Assessment

Weakness

CWE

CWE-345

OWASP Top 10:2025

A08:2025 - Software or Data Integrity Failures

ASVS 5.0

V15 - Secure Coding and Architecture Data authenticity verification

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 15, 2026

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.

Affected VersionsENISA

postiz-app < 2.21.8

Affected Packages

euvd postiz_app fix: 2.21.8

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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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

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.

Executive ViewAI

Why It Matters

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, directly impacting organizational revenue and compliance. The vulnerability requires authenticated access and has no known public exploit; exploitation risk is primarily limited to organizations with multiple Postiz users or where user accounts have been compromised. The vendor has released patch 2.21.8, which eliminates the vulnerable payment processing code entirely.

Recommended Action

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.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.2%

Top 94% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Human Impact

High

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.