# 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.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N`)
- **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:** Yes
- **Published:** 29 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-7h65-whp7-rgqf

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-9809?

2 open source packages ship an affected version, including mautic/core.


| Package | Ecosystem | 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.

## 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:

- CVE-2026-9809 is a Stored Cross-Site Scripting (Stored XSS) vulnerability affecting Mautic 7 (versions 7.0.0 through 7.1.1). (github_poc): https://github.com/aj2108/CVE-2026-9809

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9809 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-9809 in the wild and no public exploit code.

Affected packages and fixed versions:
- mautic/core (Packagist): affected from 7.0.0; fixed in 7.1.2
- mautic/core (Packagist): affected from 7.0.0; fixed in 7.1.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-9809/ (Markdown: https://insights.sbomify.com/CVE-2026-9809/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9809
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9809
- OSV: https://osv.dev/vulnerability/CVE-2026-9809

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9809/
Summaries are generated and may contain mistakes; the official description above is the record.