CVE-2026-9809

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.

CVSS Details

CVSS Score

7.6

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N

Configurations (Affected Products)

No configuration data available.

Mautic 7

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// Proof of Concept for CVE-2026-9809
// Attacker creates a project with a malicious payload in the name field.

const projectName = '"><img src=x onerror=alert(document.cookie)>';

// Alternatively:
// const projectName = '<script>alert(1)</script>';

// When an admin hovers over the project tag in the dashboard,
// the alert box will trigger, confirming the vulnerability.

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9809
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9809
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9809/
[4] VulDB https://vuldb.com/cve/CVE-2026-9809
[5] https://github.com/mautic/mautic/security/advisories/GHSA-7h65-whp7-rgqf

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9809", "sourceIdentifier": "[email protected]", "published": "2026-05-29T12:16:26.917", "lastModified": "2026-05-29T12:16:26.917", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N", "baseScore": 7.6, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://github.com/mautic/mautic/security/advisories/GHSA-7h65-whp7-rgqf", "source": "[email protected]"}]}}