CVE-2021-32667Network attack vector

Stored XSS via unencoded Page TSconfig settings

Published Jul 20, 2021 · Updated Aug 3, 2024

Persistent XSS in TYPO3 CMS 9.0.0 through 11.3.0 allows remote authenticated users to run script in a preview viewer's browser. The Web>View page-preview module inserts Page TSconfig settings into preview output without proper encoding, leaving stored markup executable. A valid backend account is required to plant the payload, and another user's preview interaction triggers browser-side script execution.

CVSS severity6.4
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Persistent XSS in TYPO3 CMS 9.0.0 through 11.3.0 allows remote authenticated users to run script in a preview viewer's browser. The Web>View page-preview module inserts Page TSconfig settings into preview output without proper encoding, leaving stored markup executable. A valid backend account is required to plant the payload, and another user's preview interaction triggers browser-side script execution.

The record

CVE
CVE-2021-32667
Published
Jul 20, 2021
Updated
Aug 3, 2024
Vendor
in2code GmbH
Product
TYPO3 CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 10.0.0, < 10.4.18
  2. Affected versionversion=>= 11.0.0, < 11.3.1
  3. Affected versionversion=>= 9.0.0, < 9.5.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

in2code GmbH · TYPO3 CMSversion=>= 10.0.0, < 10.4.18; version=>= 11.0.0, < 11.3.1; version=>= 9.0.0, < 9.5.29

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo