CVE-2021-21365

lowpriority · track · 22EPSS 0.009 · 61 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.94% (61st) EPSS

CVSS 3.5 · low

Is it mine?

24 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Bootstrap Package is a theme for TYPO3. It has been discovered that rendering content in the website frontend is vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability. Users of the extension, who have overwritten the affected templates with custom code must manually apply the security fix. Update to version 7.1.2, 8.0.8, 9.1.4, 10.0.10 or 11.0.3 of the Bootstrap Package that fix the problem described. Updated version are available from the TYPO3 extension manager, Packagist and at https://extensions.typo3.org/extension/download/bootstrap_package/.

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 (24)

Products and version ranges known to be affected.

benjaminkott bootstrap_package10.0.0, → 10.0.10enisa_euvdEU
benjaminkott bootstrap_package11.0.0, → 11.0.3enisa_euvdEU
benjaminkott bootstrap_package7.1.0, → 7.1.2enisa_euvdEU
benjaminkott bootstrap_package8.0.0, → 8.0.8enisa_euvdEU
benjaminkott bootstrap_package9.0.0, → 9.0.4enisa_euvdEU
benjaminkott bootstrap_package9.1.0, → 9.1.3enisa_euvdEU
typo3 typo3< 7.1.2nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo310.0.0 → 10.0.10nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo311.0.0 → 11.0.3nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo38.0.0 → 8.0.8nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo39.0.0 → 9.0.4nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
typo3 typo39.1.0 → 9.1.3nvdUScpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
Bitnami typo3< 7.1.2osvUSpkg:bitnami/typo3
Bitnami typo310.0.0 → 10.0.10osvUSpkg:bitnami/typo3
Bitnami typo311.0.0 → 11.0.3osvUSpkg:bitnami/typo3
Bitnami typo38.0.0 → 8.0.8osvUSpkg:bitnami/typo3
Bitnami typo39.0.0 → 9.0.4osvUSpkg:bitnami/typo3
Bitnami typo39.1.0 → 9.1.3osvUSpkg:bitnami/typo3
Packagist bk2k/bootstrap-package10.0.0 → 10.0.10osvUSpkg:composer/bk2k/bootstrap-package
Packagist bk2k/bootstrap-package11.0.0 → 11.0.3osvUSpkg:composer/bk2k/bootstrap-package

showing 20 of 24

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-p48w-vf3c-rqjxCross-Site Scripting in Bootstrap Package2021-04-29ghsa · osvUS
### Problem It has been discovered that rendering content in the website frontend is vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability. The following templates are affected by the vulnerability: * `Resources/Private/Partials/ContentElements/Carousel/Item/CallToAction.html` * `Resources/Private/Partials/ContentElements/Carousel/Item/Header.html` * `Resources/Private/Partials/ContentElements/Carousel/Item/Text.html` * `Resources/Private/Partials/ContentElements/Carousel/Item/TextAndImage.html` * `Resources/Private/Partials/ContentElements/Header/SubHeader.html` Users of the extension, who have overwritten the affected templates with custom code must manually apply the security fix as shown in [this Git commit](https://github.com/benjaminkott/bootstrap_package/commit/de3a568fc311d6712d9339643e51e8627c80530b). ### Solution Update to version 7.1.2, 8.0.8, 9.0.4, 9.1.3, 10.0.10 or 11.0.3 of the Bootstrap Package that fix the problem described. Updated version are available from the TYPO3 extension manager, Packagist and at https://extensions.typo3.org/extension/download/bootstrap_package/. ### Credits Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.
BIT-typo3-2021-213652024-03-06vendor · osvUS
Bootstrap Package is a theme for TYPO3. It has been discovered that rendering content in the website frontend is vulnerable to cross-site scripting. A valid backend user account is needed to exploit this vulnerability. Users of the extension, who have overwritten the affected templates with custom code must manually apply the security fix. Update to version 7.1.2, 8.0.8, 9.1.4, 10.0.10 or 11.0.3 of the Bootstrap Package that fix the problem described. Updated version are available from the TYPO3 extension manager, Packagist and at https://extensions.typo3.org/extension/download/bootstrap_package/.

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 2021-04-27modified 2026-06-17

references (12)

External citations — patches, advisories, analysis.

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