Server-Side Request Forgery (SSRF) in Mautic - CVE-2025-9821
Published: May 25, 2026
Vulnerability identifier: #VU132236
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-9821
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to interact with internal services and disclose partial response data.
The vulnerability exists due to server-side request forgery (SSRF) in the webhook function when sending webhooks to an unvalidated destination. A remote privileged user can configure a webhook destination to access internal services and disclose partial response data.
If the user can view webhook logs, partial request responses are disclosed.
Affected software
Mautic
How to mitigate CVE-2025-9821
Install security update from vendor's website.
Mautic - addressed in versions 4.4.18, 5.2.8, 6.0.5