CVE-2021-21340

lowpriority · track · 22EPSS 0.009 · 59 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.87% (59th) EPSS

CVSS 3.5 · low

Is it mine?

12 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

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 database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1 .

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–5.4

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.3 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.3 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

affected products (12)

Products and version ranges known to be affected.

TYPO3 TYPO3.CMS≤ 11.0.0, ≤ 11.1.0enisa_euvdEU
TYPO3 TYPO3.CMS≤ 10.0.0, ≤ 10.4.13enisa_euvdEU
typo3 typo310.0.0 → 10.4.14nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo311.0.0 → 11.1.1nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
Bitnami typo310.0.0 → 10.4.14osvUSpkg:bitnami/typo3
Bitnami typo311.0.0 → 11.1.1osvUSpkg:bitnami/typo3
Packagist typo3/cms10.0.0 → 10.4.14osvUSpkg:composer/typo3/cms
Packagist typo3/cms11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms
Packagist typo3/cms-backend10.0.0 → 10.4.14osvUSpkg:composer/typo3/cms-backend
Packagist typo3/cms-backend11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms-backend
Packagist typo3/cms-core10.0.0 → 10.4.14osvUSpkg:composer/typo3/cms-core
Packagist typo3/cms-core11.0.0 → 11.1.1osvUSpkg:composer/typo3/cms-core

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-fjh3-g8gq-9q92Cross-Site Scripting in Content Preview2021-03-23ghsa · osvUS
### Problem It has been discovered that database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed in the page module. A valid backend user account is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 10.4.14, 11.1.1 that fix the problem described. ### Credits Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue. ### References * [TYPO3-CORE-SA-2021-007](https://typo3.org/security/advisory/typo3-core-sa-2021-007)
BIT-typo3-2021-213402024-03-06vendor · osvUS
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 database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1 .

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2021-03-23modified 2026-06-17

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+53006 more

references (12)

External citations — patches, advisories, analysis.

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