What is CVE-2026-9811?

CVE-2026-9811 is a medium-severity vulnerability, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-29.

How severe is CVE-2026-9811?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CVE-2026-9811

CVE-2026-9811

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (7.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@mautic.org

Frequently asked questions

What is CVE-2026-9811?: CVE-2026-9811 is a medium-severity vulnerability, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-29.
How severe is CVE-2026-9811?: Medium severity. CVSS v3 base score is 5.4 out of 10.