CVE-2026-48783
Postiz has an unauthenticated billing-enforcement bypass via /public/modify-subscription
Description
Postiz is an AI social media scheduling tool. Versions prior to 2.21.8 contained an unauthenticated endpoint that accepted a signed token and applied subscription-enforcement side effects to the organization referenced in that token's claims, without verifying the token's intended purpose. The endpoint, /public/modify-subscription, could not change the persisted subscription tier, but it did execute enforcement-related side effects on the caller's own organization, including adjusting team-member enablement state, disabling integrations exceeding the asserted plan's limits, and resetting the scheduled-post cron when the asserted plan was the free tier. Impact is limited to the attacker's own organization and cannot be redirected at other tenants through this endpoint. This issue has been fixed in version 2.21.8.
INFO
Published Date :
June 17, 2026, 1:20 p.m.
Last Modified :
Oct. 26, 2026, 11:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Postiz to version 2.21.8 or later.
- Apply vendor patches for Postiz immediately.
- Review access controls for sensitive endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48783.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48783 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48783
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48783 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48783 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: postiz-app de gitroomhq, Description: Postiz es una herramienta de programación de redes sociales con IA. Las versiones anteriores a la 2.21.8 contenían un endpoint no autenticado que aceptaba un token firmado y aplicaba efectos secundarios de aplicación de suscripción a la organización referenciada en las declaraciones de ese token, sin verificar el propósito previsto del token. El endpoint, /public/modify-subscription, no podía cambiar el nivel de suscripción persistido, pero sí ejecutaba efectos secundarios relacionados con la aplicación en la propia organización del llamador, incluyendo el ajuste del estado de habilitación de los miembros del equipo, la deshabilitación de integraciones que excedían los límites del plan declarado, y el restablecimiento del cron de publicaciones programadas cuando el plan declarado era el nivel gratuito. El impacto se limita a la propia organización del atacante y no puede ser redirigido a otros inquilinos a través de este endpoint. Este problema ha sido solucionado en la versión 2.21.8. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48783', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-17T12:43:27.137971Z'} -
New CVE Received by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'gitroomhq', 'product': 'postiz-app', 'versions': [{'status': 'affected', 'version': '< 2.21.8'}]}] Added Description Postiz is an AI social media scheduling tool. Versions prior to 2.21.8 contained an unauthenticated endpoint that accepted a signed token and applied subscription-enforcement side effects to the organization referenced in that token's claims, without verifying the token's intended purpose. The endpoint, /public/modify-subscription, could not change the persisted subscription tier, but it did execute enforcement-related side effects on the caller's own organization, including adjusting team-member enablement state, disabling integrations exceeding the asserted plan's limits, and resetting the scheduled-post cron when the asserted plan was the free tier. Impact is limited to the attacker's own organization and cannot be redirected at other tenants through this endpoint. This issue has been fixed in version 2.21.8. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Added CWE CWE-345 Added CWE CWE-749 Added CWE CWE-639 Added CWE CWE-862 Added Reference https://gadvisory.org/advisories/PSA-2026-WWFR8X Added Reference https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05 Added Reference https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8 Added Reference https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-v4wr-4j8g-4hfj