CVE-2026-35572: SSRF via Referer header in ChurchCRM allows server-side HTTP/HTTPS requests to arbitrary hosts

Severity: medium (CVSS 6.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-07 · updated 2026-10-26
Weakness: CWE-918

Description

ChurchCRM is an open-source church management system. Prior to 6.5.3, it is possible to trigger server-side HTTP/HTTPS requests to arbitrary hosts (SSRF) by supplying a crafted URL in the Referer request header. The server subsequently makes an outbound request to the attacker-controlled domain, confirmed via OAST. This vulnerability is fixed in 6.5.3.

Affected products

ChurchCRM CRM: before 6.5.3 — fixed in 6.5.3

How to fix

Upgrade to a fixed version: ChurchCRM CRM 6.5.3. Check the vendor advisory for mitigations.

References

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