CVE-2026-9809 Mautic has Stored Cross-Site Scripting (XSS) in Projects Component
Authenticated users can inject scripts into project tags, allowing attackers to execute code in admin sessions to take over accounts or steal data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-9809?
CVE-2026-9809 is a high-severity cross-site scripting vulnerability in mautic/core, published on 29 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A stored Cross-Site Scripting (XSS) vulnerability exists in the Projects component of Mautic 7. When displaying project tags and popovers on administrative detail views (such as campaigns, emails, or forms), user-supplied project names are rendered without proper sanitization. An authenticated user with permissions to create or edit projects can exploit this to inject malicious script payloads. When an administrative user views an entity associated with a compromised project and hovers over its tag, the injected script executes within the context of their active browser session. This could allow an attacker to perform administrative actions on behalf of the victim, alter system configurations, or exfiltrate sensitive data.
Weakness: CWE-79
Which versions are affected by CVE-2026-9809?
2 open source packages ship an affected version, including mautic/core.
| Package | Affected | Fixed in |
|---|---|---|
mautic/core Packagist | From 7.0.0 | 7.1.2 |
mautic/core Packagist | From 7.0.0 | 7.1.2 |
How do I fix CVE-2026-9809?
Upgrade mautic/core to 7.1.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-9809 being exploited?
There is no known exploitation of CVE-2026-9809 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-7h65-whp7-rgqf.