CVE-2026-48799: CWE-345: Insufficient Verification of Data Authenticity in gitroomhq postiz-app
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.
AI Analysis
Technical Summary
CVE-2026-48799 describes an insufficient verification of data authenticity in the postiz-app before version 2.21.8. The application does not properly verify Nowpayments IPN callback authenticity against the payment provider's shared secret, and it reads the subscription identifier from an untrusted request body. This flaw enables a low-privileged account to escalate privileges by granting lifetime PRO subscriptions to arbitrary organizations without payment. The vulnerability is addressed in postiz-app version 2.21.8.
Potential Impact
An attacker with low privileges can exploit this vulnerability to grant lifetime PRO subscriptions to any organization without making a payment. This results in unauthorized access to premium features, causing potential financial loss to the vendor and undermining subscription integrity. There is no indication of confidentiality or availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade postiz-app to version 2.21.8 or later, where the vulnerability is fixed. Since the vendor has released a fixed version, applying this official update is the recommended remediation. Patch status is confirmed by the vendor's advisory stating the issue is fixed in 2.21.8.
CVE-2026-48799: CWE-345: Insufficient Verification of Data Authenticity in gitroomhq postiz-app
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.
CVSS v3.1
Score 7.7high
Affected software
pkg:github/gitroomhq/postiz-appRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-48799 describes an insufficient verification of data authenticity in the postiz-app before version 2.21.8. The application does not properly verify Nowpayments IPN callback authenticity against the payment provider's shared secret, and it reads the subscription identifier from an untrusted request body. This flaw enables a low-privileged account to escalate privileges by granting lifetime PRO subscriptions to arbitrary organizations without payment. The vulnerability is addressed in postiz-app version 2.21.8.
Potential Impact
An attacker with low privileges can exploit this vulnerability to grant lifetime PRO subscriptions to any organization without making a payment. This results in unauthorized access to premium features, causing potential financial loss to the vendor and undermining subscription integrity. There is no indication of confidentiality or availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade postiz-app to version 2.21.8 or later, where the vulnerability is fixed. Since the vendor has released a fixed version, applying this official update is the recommended remediation. Patch status is confirmed by the vendor's advisory stating the issue is fixed in 2.21.8.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-22T20:18:20.366Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57b64168715ace430b3841
Added to database: 07/15/2026, 16:33:05 UTC
Last enriched: 07/15/2026, 16:47:59 UTC
Last updated: 07/15/2026, 19:03:54 UTC
Views: 4
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