CVE-2021-21370

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?

26 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 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 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-79USCWE-79US

affected products (26)

Products and version ranges known to be affected.

TYPO3 TYPO3.CMS≤ 10.0.0, ≤ 10.4.13enisa_euvdEU
TYPO3 TYPO3.CMS≤ 8.0.0, ≤ 8.7.39enisa_euvdEU
TYPO3 TYPO3.CMS≤ 7.0.0, ≤ 7.6.50enisa_euvdEU
TYPO3 TYPO3.CMS≤ 11.0.0, ≤ 11.1.0enisa_euvdEU
TYPO3 TYPO3.CMS≤ 9.0.0, ≤ 9.5.24enisa_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:*:*:*:*:*:*:*:*
typo3 typo37.0.0 → 7.6.51nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo38.0.0 → 8.7.40nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo39.0.0 → 9.5.25nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
Bitnami typo310.0.0 → 10.4.14osvUSpkg:bitnami/typo3
Bitnami typo311.0.0 → 11.1.1osvUSpkg:bitnami/typo3
Bitnami typo37.0.0 → 7.6.51osvUSpkg:bitnami/typo3
Bitnami typo38.0.0 → 8.7.40osvUSpkg:bitnami/typo3
Bitnami typo39.0.0 → 9.5.25osvUSpkg: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/cms9.0.0 → 9.5.25osvUSpkg: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

showing 20 of 26

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-x7hc-x7fm-f7qhCross-Site Scripting in Content Preview (CType menu)2021-03-23ghsa · osvUS
### Problem It has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described. ### Credits Thanks to TYPO3 contributor Oliver Bartsch who reported and fixed the issue. ### References * [TYPO3-CORE-SA-2021-008](https://typo3.org/security/advisory/typo3-core-sa-2021-008)
BIT-typo3-2021-213702024-03-06vendor · osvUS
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 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

references (12)

External citations — patches, advisories, analysis.

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