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CVE Record

CVE-2021-32667: Cross-Site Scripting in Page Preview

TYPO3 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 _Page TSconfig_ settings are not properly encoded, corresponding page preview module (_Web>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 issue.

MediumCVSS 6.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw lets a logged-in TYPO3 backend user plant script content through Page TSconfig that can execute in the page preview view. It is not remotely exploitable by an anonymous internet user, but it can expose or alter sensitive backend session data if a privileged user views affected preview content.

Executive priority

Treat this as a scheduled but important CMS security update. It requires authenticated backend access, lowering internet-scale urgency, but compromise could affect sensitive CMS users and content integrity.

Technical view

CVE-2021-32667 is a persistent cross-site scripting issue in TYPO3 CMS Page Preview (Web>View) caused by improper encoding of Page TSconfig settings. Affected ranges are 9.0.0-9.5.28, 10.0.0-10.4.17, and 11.0.0-11.3.0. CVSS 3.1 is 6.4, with low privileges, user interaction, high complexity, and high confidentiality/integrity impact.

Likely exposure

Exposure is most likely on TYPO3 CMS sites running affected 9.x, 10.x, or 11.x versions where backend users can modify relevant Page TSconfig and other backend users use the Web>View preview module.

Exploitation context

The source bundle states exploitation requires a valid backend user account and user interaction. KEV is false, and the provided sources do not state active exploitation in the wild.

Researcher notes

Evidence supports CWE-79 persistent XSS in Page Preview through improperly encoded Page TSconfig. Sources do not provide exploit details or indicators. Focus validation on version ranges, backend privilege paths, and preview-module usage rather than external scanning alone.

Mitigation direction

  • Upgrade TYPO3 CMS to 9.5.29, 10.4.18, 11.3.1, or later supported releases.
  • Review TYPO3 vendor advisories before applying compensating controls.
  • Limit backend accounts to users who genuinely need Page TSconfig permissions.
  • Review backend user roles and remove unnecessary content or configuration privileges.

Validation and detection

  • Inventory TYPO3 CMS versions across public and internal sites.
  • Confirm affected instances are upgraded beyond the vulnerable version ranges.
  • Review backend roles for users able to edit relevant Page TSconfig.
  • Check whether affected teams use the Web>View page preview module.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-32667 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N1.25.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.4Medium
CVSS 3.1 vector shape for CVE-2021-32667Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TYPO3TYPO3.CMS>= 9.0.0, < 9.5.29, >= 10.0.0, < 10.4.18, >= 11.0.0, < 11.3.1Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.