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Vulnerabilities

Vulnerability · CVE-2021-21358

CVE-2021-21358 is listed by TYPO3 is an open source PHP based web content management system..

Published Mar 23, 2021 · catalog updated Jun 17, 2026 · the affected product

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-21358. EPSS is 0.87%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.87%
Remediation
Version ranges on file
Affected products
cpe typo3/typo3

CVE-2021-21358 is listed by TYPO3 is an open source PHP based web content management system..

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 typo3/typo3< 10.4.14
  • cpe typo3/typo3< 11.1.1

How to fix CVE-2021-21358

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-2021-21358. EPSS is 0.87%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with < 10.4.14, < 11.1.1. 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 0.87%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

TYPO3 security

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Mar 23, 2021 · Monitored products — high

    Detected

    CVE-2021-21358 is listed by TYPO3 is an open source PHP based web content management system..

  2. Jun 17, 2026 · Monitored products — high

    Updated

    CVE-2021-21358 is listed by TYPO3 is an open source PHP based web content management system..

Sources

  • CVE.orgVulnerability recordCVE-2021-21358

    Official CVE identifier

    cve.org
  • Monitored products — highVendor advisoryCVE-2021-21358

    TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — highNov 4, 2026