CVE-2021-27911

XSS vulnerability on contacts view

MEDIUM
6.1
CVSS Score
Published: August 30, 2021 at 03:55 PM UTC
Updated: June 17, 2026 at 03:45 AM UTC
1 product affected across 1 vendorMautic

Using Mautic by Mautic?

Get instant alerts when new vulnerabilities affect Mautic - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.1
Exploit prediction
EPSS 0.6%

Description

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.

Affected

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

95%
Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.0, 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:

References (1)

CVSS

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

Quick Info

StatusMODIFIED
CWE
CWE-79

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card