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    CVE-2026-42556

    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.

    Published:May 8, 2026
    Last Modified:May 18, 2026
    EPS:May 8, 2026
    EPSS Score:0.00041
    CVSS Score:8.9

    Affected Products

    Vendor
    Gitroom
    Product
    Postiz
    Vendor
    Gitroomhq
    Product
    Postiz-app

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-42298 (CVSS 10) — Postiz is an AI social media scheduling tool. Prior to commit da44801, a "Pwn Request" vulnerability in the Bu…
    CVE-2026-40487 (CVSS 8.9) — Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows …
    CVE-2026-40168 (CVSS 8.2) — Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable t…
    CVE-2026-34590 (CVSS 5.4) — Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creati…
    CVE-2026-34577 (CVSS 8.6) — Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in Publ…
    CVE-2026-34576 (CVSS 8.3) — Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the POST /public/v1/upload-from-url end…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High