What is CVE-2021-21365?

CVE-2021-21365 is a vulnerability in the Bootstrap Package theme for TYPO3 that allows for cross-site scripting (XSS) attacks.

How severe is CVE-2021-21365?

CVE-2021-21365 has a severity score of 5.4, which is considered medium.

Which TYPO3 versions are affected by CVE-2021-21365?

TYPO3 versions 7.1.2 up to exclusive, 8.0.0 up to inclusive (8.0.8 exclusive), 9.0.0 up to inclusive (9.0.4 exclusive), 9.1.0 up to inclusive (9.1.3 exclusive), 10.0.0 up to inclusive (10.0.10 exclusive), and 11.0.0 up to inclusive (11.0.3 exclusive) are affected by CVE-2021-21365.

Can this vulnerability be exploited without a valid backend user account?

No, a valid backend user account is needed to exploit CVE-2021-21365.

How can I fix CVE-2021-21365?

To fix CVE-2021-21365, TYPO3 users should update to a version where the vulnerability has been fixed and apply the necessary security patches.

Vulnerability/
CVE-2021-21365

medium

5.4

CWE

27/4/2021

7/5/2021

CVE-2021-21365: XSS

First published: Tue Apr 27 2021(Updated: )

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/.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Typo3 Typo3	<7.1.2
Typo3 Typo3	>=8.0.0<8.0.8
Typo3 Typo3	>=9.0.0<9.0.4
Typo3 Typo3	>=9.1.0<9.1.3
Typo3 Typo3	>=10.0.0<10.0.10
Typo3 Typo3	>=11.0.0<11.0.3

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Frequently Asked Questions

What is CVE-2021-21365?
CVE-2021-21365 is a vulnerability in the Bootstrap Package theme for TYPO3 that allows for cross-site scripting (XSS) attacks.
How severe is CVE-2021-21365?
CVE-2021-21365 has a severity score of 5.4, which is considered medium.
Which TYPO3 versions are affected by CVE-2021-21365?
TYPO3 versions 7.1.2 up to exclusive, 8.0.0 up to inclusive (8.0.8 exclusive), 9.0.0 up to inclusive (9.0.4 exclusive), 9.1.0 up to inclusive (9.1.3 exclusive), 10.0.0 up to inclusive (10.0.10 exclusive), and 11.0.0 up to inclusive (11.0.3 exclusive) are affected by CVE-2021-21365.
Can this vulnerability be exploited without a valid backend user account?
No, a valid backend user account is needed to exploit CVE-2021-21365.
How can I fix CVE-2021-21365?
To fix CVE-2021-21365, TYPO3 users should update to a version where the vulnerability has been fixed and apply the necessary security patches.

collector/nvd-index
vendor/typo3
canonical/typo3 typo3
version/typo3 typo3/8.0.0
version/typo3 typo3/9.0.0
version/typo3 typo3/9.1.0
version/typo3 typo3/10.0.0
version/typo3 typo3/11.0.0

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