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Vulnerabilities

Vulnerability · CVE-2026-42556

Postiz is an AI social media scheduling tool.

Published May 8, 2026 · catalog updated Jul 24, 2026 · Postiz is an AI

Check if you run it

No confirmed exploitation is on record for CVE-2026-42556. EPSS is 0.44%. Act only if a listed version of Postiz is an AI is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Postiz is an AI).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Advisory link
Affected products
cpe gitroom/postiz

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/ ?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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe gitroom/postiz2.21.6

How to fix CVE-2026-42556

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42556. EPSS is 0.44%. Act only if a listed version of Postiz is an AI is installed.

Which versions are affected?

Compare what you have installed with 2.21.6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 8, 2026 · NIST NVD

    Detected

    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/ ?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has be

  2. Jul 24, 2026 · NIST NVD

    Updated

    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/ ?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has be

Sources

  • CVE.orgVulnerability recordCVE-2026-42556

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42556

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-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/ ?share=true to another

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.