Stored Cross-Site Scripting Vulnerability in Mautic by Mautic
CVE-2026-9809

7.6HIGH

Key Information:

Status
Vendor
CVE Published:
29 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9809?

In Mautic 7, a stored Cross-Site Scripting (XSS) vulnerability exists within the Projects component. This flaw arises due to improper sanitization of user-supplied project names displayed in administrative detail views, such as campaigns, emails, or forms. When an authenticated user, who has permission to create or edit projects, inputs a compromised project name, injected scripts can execute when administrative users interact with affected entities. This manipulation allows attackers to perform unintended administrative actions, modify system configurations, or extract sensitive information from the vulnerable system.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-9809
Created by aj2108

References

https://github.com/mautic/mautic/security/advisories/GHSA...

CVSS V3.1

Score:
7.6
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

@34selen
John Linhart (@escopecz)
Patryk Gruszka (@patrykgruszka)
Leuchtfeuer Digital Marketing (@Leuchtfeuer)
.