CVE-2021-21365

Cross-Site Scripting in Content Rendering

MEDIUM

5.4

CVSS Score

Published: April 27, 2021 at 07:30 PM UTC

Updated: June 17, 2026 at 03:35 AM UTC

2 products affected across 2 vendorsTYPO3TYPO3

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.9%

Description

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/.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

TYPO3 · TYPO3composer

95%

v < 7.1.210.0.0 ≤ v < 10.0.1011.0.0 ≤ v < 11.0.38.0.0 ≤ v < 8.0.89.0.0 ≤ v < 9.0.49.1.0 ≤ v < 9.1.3

Affected range stops below 10.0.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.1.3, so it looks safe — our inference, not a vendor statement

TYPO3 · Benjaminkott

60%

v < 10.0.10v < 11.0.3v < 7.1.2v < 8.0.8v < 9.0.4v < 9.1.3

Affected range stops below 10.0.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.1.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/benjaminkott/bootstrap_package/commit/de3a568fc311d6712d9339643e51e8627c80530b

x_refsource_CONFIRMExploitThird Party Advisory

Source: [email protected]

https://github.com/benjaminkott/bootstrap_package/security/advisories/GHSA-p48w-vf3c-rqjx

x_refsource_MISCExploitPatchVendor Advisory

Source: [email protected]

https://typo3.org/security/advisory/typo3-ext-sa-2021-007

CVSS

5.4MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-79

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