Stored Cross-Site Scripting Vulnerability in Mautic by Mautic
CVE-2026-9811

5.4MEDIUM

Key Information:

Status
Vendor
CVE Published:
29 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9811?

A stored Cross-Site Scripting (XSS) vulnerability exists in the project selector component of Mautic 7. The application inadequately sanitizes project names retrieved via AJAX, which can lead to malicious scripts being injected into the DOM. An authenticated user capable of creating projects can exploit this flaw to store harmful script payloads in project names. When another administrator accesses an entity editor featuring the project selector, the injected script can execute within their browser session. This vulnerability poses risks such as session hijacking, unauthorized actions, or exposure of sensitive organizational data on the dashboard.

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-2026-9811
Created by aj2108

References

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

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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

@pavelkohout396
John Linhart (@escopecz)
Patryk Gruszka (@patrykgruszka)
Leuchtfeuer Digital Marketing (@Leuchtfeuer)
.