CVE-2026-9811: Mautic stored XSS in project selector component

CVE-2026-9811 · Severity: medium · CVSS 5.4 · Published 2026-05-29

Mautic, an open-source marketing automation platform, contains a security vulnerability in its project management feature. An attacker with basic user permissions can save a malicious script as a project name. When an administrator later views this project, the script executes in their browser, potentially allowing the attacker to steal session information, access sensitive organizational data, or perform actions on behalf of the administrator.

Technologies: Mautic, mautic/core (Packagist). Vendors: Mautic, Packagist.

Quick answers

Is CVE-2026-9811 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-9811 being exploited in the wild.
How severe is CVE-2026-9811?
Medium severity, with a CVSS score of 5.4, published 29 May 2026.
Which products and versions are affected?
Mautic >= 7.0.0, < 7.1.2; mautic/core (Packagist) ECOSYSTEM:introduced=7.0.0,fixed=7.1.2.
Is there a fix for CVE-2026-9811?
Yes. mautic/core (Packagist): upgrade to 7.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-9811 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9811?
Check whether you run Mautic or mautic/core (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • mautic/core (Packagist): upgrade to 7.1.2 or later
    composer require mautic/core:^7.1.2

Technical details

A stored Cross-Site Scripting (XSS) vulnerability exists in the project selector component of Mautic 7. The root cause is a failure to sanitize project names returned via AJAX before they are injected into the DOM as option fields within selection menus. An authenticated attacker with 'create project' permissions can inject a malicious payload into a project name. When an administrative user opens an entity editor that loads this project selector, the payload executes in their session context (CWE-79). This can lead to session hijacking or unauthorized data access. The issue is fixed in version 7.1.2.

Affected products

  • Mautic Mautic Core >= 7.0.0, < 7.1.2

Identifiers

  • CVE-2026-9811
  • GHSA-5hvg-w58j-545m

Timeline

  • 2026-05-29: disclosed: NVD publication date
  • 2026-07-02: advisory: GitHub Advisory published
  • 2026-07-02: patched: Version 7.1.2 released

References

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