Postiz has an unauthenticated billing-enforcement bypass via /public/modify-subscription

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Summary

CVECVE-2026-48783
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-17 13:20:43 UTC
Updated2026-06-17 16:18:00 UTC
DescriptionPostiz 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.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Problem Types: CWE-345 | CWE-639 | CWE-749 | CWE-862 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-749 CWE-749: Exposed Dangerous Method or Function | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gitroomhq Postiz-app affected < 2.21.8 Not specified

References

ReferenceSourceLinkTags
github.com/gitroomhq/postiz-app/security/advisories/GHSA-v4wr-4j8g-4hfj [email protected] github.com
github.com/gitroomhq/postiz-app/releases/tag/v2.21.8 [email protected] github.com
gadvisory.org/advisories/PSA-2026-WWFR8X [email protected] gadvisory.org
github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf... [email protected] github.com
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