gitroomhq postiz-app up to 2.21.7 Endpoint modify-subscription data authenticity

Summaryinfo

A vulnerability has been found in gitroomhq postiz-app up to 2.21.7 and classified as problematic. Impacted is an unknown function of the file /public/modify-subscription of the component Endpoint. This manipulation causes data authenticity. This vulnerability appears as CVE-2026-48783. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in gitroomhq postiz-app up to 2.21.7. It has been declared as problematic. Affected by this vulnerability is an unknown part of the file /public/modify-subscription of the component Endpoint. The manipulation with an unknown input leads to a data authenticity vulnerability. The CWE definition for the vulnerability is CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. As an impact it is known to affect integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-48783 since 05/22/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.21.8 eliminates this vulnerability.

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Productinfo

Vendor

• gitroomhq

Name

• postiz-app

Version

• 2.21.0
• 2.21.1
• 2.21.2
• 2.21.3
• 2.21.4
• 2.21.5
• 2.21.6
• 2.21.7

Website

• Product: https://github.com/gitroomhq/postiz-app/

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