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Postiz App CVE-2026-42556

HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-05-08 GitHub_M
XSS Postiz App
8.9
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
8.9 HIGH
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

1
CVE Published
May 08, 2026 - 22:28 nvd
HIGH 8.9

DescriptionGitHub Advisory

Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7.

Analysis

Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7.

More in Postiz App

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9.9 Jun 16

Privilege escalation to SUPERADMIN in Postiz (gitroomhq/postiz-app) versions prior to 2.21.8 allows any authenticated us
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Server-side request forgery in Postiz AI social media scheduling tool (versions < 2.21.3) allows unauthenticated remote

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Server-side request forgery (SSRF) in Postiz social media scheduling tool versions prior to 2.21.3 allows authenticated

CVE-2026-40168 HIGH
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Server-side request forgery in Postiz (gitroomhq postiz-app) versions prior to 2.21.5 allows unauthenticated remote atta
CVE-2026-48799 HIGH
7.7 Jul 15

Business-logic authentication bypass in Postiz self-hosted AI social media scheduler (gitroomhq/postiz-app) before 2.21.
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6.5 May 08

Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added i
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5.4 Apr 02

Server-side request forgery (SSRF) in Postiz prior to version 2.21.4 allows authenticated users to create webhooks point
CVE-2026-48783 MEDIUM
4.8 Jun 16

Unauthenticated exploitation of Postiz's `/public/modify-subscription` endpoint allowed any caller in possession of a va

Same weakness CWE-79 – Cross-site Scripting (XSS)

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CVE-2013-7389 MEDIUM POC
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CVE-2014-2120 MEDIUM
6.1
CVE-2023-40000 HIGH POC
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CVE-2016-8581 MEDIUM POC
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CVE-2013-5223 MEDIUM POC
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CVE-2025-52367 MEDIUM POC
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CVE-2015-0072 MEDIUM POC
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Same technique XSS

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CVE-2017-9248 CRITICAL POC
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CVE-2013-1710 CRITICAL POC
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CVE-2013-7389 MEDIUM POC
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CVE-2021-25299 MEDIUM POC
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CVE-2014-2120 MEDIUM
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CVE-2023-40000 HIGH POC
8.3
CVE-2024-52875 HIGH POC
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CVE-2016-8581 MEDIUM POC
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CVE-2026-42556 vulnerability details – vuln.today
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