TYPO3CMS
CVE-2021-32669
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedTYPO3 is an open source PHP based web content management system. Versions 9.0.0 through 9.5.28, 10.0.0 through 10.4.17, and 11.0.0 through 11.3.0 have a cross-site scripting vulnerability. When settings for _backend layouts_ are not properly encoded, the corresponding grid view is vulnerable to persistent cross-site scripting. A valid backend user account is needed to exploit this vulnerability. TYPO3 versions 9.5.29, 10.4.18, 11.3.1 contain a patch for this vulnerability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceTYPO3 versions 9.x, 10.x, and 11.x have a persistent cross-site scripting vulnerability in backend layouts. When backend layout settings are not properly encoded before rendering in the grid view, malicious scripts can be stored and executed. Exploitation requires a valid backend user account.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
TYPO3CMS
>= 8.0.0, <= 8.7.40>= 9.0.0, <= 9.5.28>= 10.0.0, <= 10.4.17>= 11.0.0, <= 11.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine installed TYPO3 versionCheck the version file in your TYPO3 installation (typically in composer.json or the typo3/sysext/core/composer.json file contains the version), or access the TYPO3 install tool and check the core versionAffected if The installed version falls within any of these ranges: 8.0.0-8.7.40, 9.0.0-9.5.28, 10.0.0-10.4.17, or 11.0.0-11.3.0
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Identify if backend layouts are in useIn the TYPO3 backend, navigate to the Template module or Page Properties and check if any backend layouts have been created or assigned to pages. Alternatively, check the database table 'backend_layout' for records.Affected if Backend layouts have been created or assigned to pages in the installation
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Inspect backend layout records for malicious contentQuery the database table 'tx_templavoila_datastructure' or 'backend_layout' (depending on whether you use TemplaVoila or native backend layouts) for any layout records containing script tags, javascript: prefixes, or HTML event handlers in title, description, or configuration fields.Affected if Any backend layout records contain unencoded script tags, javascript: URIs, or event handler attributes (onclick, onerror, etc.) in their configuration fields
You are affected if your TYPO3 version is within the vulnerable ranges AND backend layouts exist in your system AND those layouts contain malicious script content injected by an attacker with backend access.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade TYPO3 to version 9.5.29, 10.4.18, or 11.3.1 which contain the patch for proper encoding of backend layout settings.
Fix this in TYPO3
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,848.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32669 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-32669 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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