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CVE-2026-48783— Postiz has an unauthenticated billing-enforcement bypass via /public/modify-subscription

Quick assessment

Affected
gitroomhq postiz-app
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gitroomhq postiz-app是gitroomhq的社交媒体内容规划与发布平台。 gitroomhq postiz-app 2.21.8之前版本存在安全漏洞，该漏洞源于未验证令牌预期目的的端点，可能导致攻击者对其自身组织执行订阅强制相关副作用，如调整团队成员启用状态、禁用超出计划限制的集成以及重置定时发布任务。

CVSS 4.8 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
gitroomhq postiz-app < 2.21.8 affected
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I. Basic Information for CVE-2026-48783

Vulnerability Information
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Vulnerability Title
Postiz has an unauthenticated billing-enforcement bypass via /public/modify-subscription
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
gitroomhq postiz-app 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gitroomhq postiz-app是gitroomhq的社交媒体内容规划与发布平台。 gitroomhq postiz-app 2.21.8之前版本存在安全漏洞，该漏洞源于未验证令牌预期目的的端点，可能导致攻击者对其自身组织执行订阅强制相关副作用，如调整团队成员启用状态、禁用超出计划限制的集成以及重置定时发布任务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gitroomhq postiz-app < 2.21.8 -

II. Public POCs for CVE-2026-48783

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III. Intelligence Information for CVE-2026-48783

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Vendor Advisories for CVE-2026-48783 (2)

Vendor Pages for CVE-2026-48783 (1)

IV. Related Vulnerabilities

Same product: postiz-app
Same vendor: gitroomhq
Same weakness: CWE-345

V. Comments for CVE-2026-48783

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