CVE-2026-9811: XSS
Summary A stored Cross-Site Scripting (XSS) vulnerability exists in the project selector component of Mautic 7. When rendering selection menus for associating projects with system entities, the application fails to sanitize project names returned via AJAX before injecting them into the DOM as option fields. An authenticated user with permissions to create projects can exploit this to store a malicious script payload in the project's name.
Impact When another administrative user subsequently opens an entity editor containing the project selector, the injected script executes within the context of their active browser session. This could allow an attacker to hijack the session, perform unauthorized state coordination, or access organizational data within the dashboard.
Patched Versions This security issue has been addressed in the following release: 7.1.2
Note: Mautic 6.x, 5.x, and 4.x branches do not contain the Projects feature or the associated AJAX selector and are not affected by this vulnerability. For general security support regarding legacy Mautic 4 releases, please refer to the ELTS page.
Workarounds There are no official workarounds. To mitigate this vulnerability without upgrading, restrict project creation and modification permissions to trusted administrative users.
Other sources
A stored Cross-Site Scripting (XSS) vulnerability exists in the project selector component of Mautic 7. When rendering selection menus for associating projects with system entities, the application fails to sanitize project names returned via AJAX before injecting them into the DOM as option fields. An authenticated user with permissions to create projects can exploit this to store a malicious script payload in the project's name. When another administrative user subsequently opens an entity editor containing the project selector, the injected script executes within the context of their active browser session. This could allow an attacker to hijack the session, perform unauthorized state coordination, or access organizational data within the dashboard.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
composer/mautic/coreto a version that resolves this vulnerability.Fixed in 7.1.2 - Upgrade
Upgrade
mauticto a version that resolves this vulnerability.Fixed in 7.1.2 - Compensating control
Mitigate without upgrading by restricting project creation and modification permissions to trusted administrative users only.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-9811?
CVE-2026-9811 has a medium severity rating of 5.4.
How do I fix CVE-2026-9811?
To fix CVE-2026-9811, update Mautic to the latest version that includes the security patch.
What type of vulnerability is CVE-2026-9811?
CVE-2026-9811 is a stored Cross-Site Scripting (XSS) vulnerability.
What systems are affected by CVE-2026-9811?
CVE-2026-9811 affects the project selector component of Mautic 7.
What is the risk level associated with CVE-2026-9811?
CVE-2026-9811 has a risk level of 25, indicating a notable security concern.