ByteOS Network

CVE Vulnerability Details :

CVE-2026-42556

PUBLISHED

More Info Official Page

Assigner-GitHub_M

Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa

Published At-08 May, 2026 | 22:28

Updated At-08 May, 2026 | 22:28

▼CVE Numbering Authority (CNA)

Postiz stored XSS in public preview page

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.

Affected Products

Vendor

gitroomhq

Product

postiz-app

Versions

Affected

>= 2.21.6, < 2.21.7

Problem Types

Type	CWE ID	Description
CWE	CWE-79	CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Type: CWE

CWE ID: CWE-79

Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Metrics

Version	Base score	Base severity	Vector
3.1	8.9	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Version: 3.1

Base score: 8.9

Base severity: HIGH

Vector:

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

References

Hyperlink	Resource
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8	x_refsource_CONFIRM
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7	x_refsource_MISC

Hyperlink: https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8

Resource:

x_refsource_CONFIRM

Hyperlink: https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7

Resource:

x_refsource_MISC

Affected Products

Affected

Problem Types

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References