### Impact
Mautic versions before 3.3.4/4.0.0 are vulnerable to an inline JS XSS attack through the contact's first or last name and triggered when viewing a contact's details page then clicking on the action drop down and hovering over the Campaigns button. Contact first and last name can be populated from different sources such as UI, API, 3rd party syncing, forms, etc.

### Patches
Upgrade to 3.3.4 or 4.0.0

### Workarounds
No

### References
https://github.com/mautic/mautic/releases/tag/3.3.4
https://github.com/mautic/mautic/releases/tag/4.0.0

### For more information
If you have any questions or comments about this advisory:
* Email us at [[email protected]](mailto:[email protected])

Affected Packages

Packagist mautic/core

Affected versions: 0 (fixed in 3.3.4)

Packagist mautic/core

Affected versions: 4.0.0-alpha1 (fixed in 4.0.0)

Related CVEs

CVE-2021-27911

Key Information

GHSA ID

GHSA-72hm-fx78-xwhc

Published

September 1, 2021 6:40 PM

Last Modified

August 30, 2021 6:05 PM

CVSS Score

7.5 /10

Primary Ecosystem

Packagist

Primary Package

mautic/core

GitHub Reviewed

✓ Yes

Dataset

Last updated: June 18, 2025 6:25 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.