Report: Complete Guide to CVE-2026-41687 - Wallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not ...

Report: Complete Guide to CVE-2026-41687 - Wallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not ...

CVE ID :CVE-2026-41687 Published : May 7, 2026, 1:48 p.m. | 1 hour, 16 minutes ago Description :Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.8.1, the SSRF protection in endpoints/subscription/add.php (line 42) and endpoints/payments/add.php (line 40) uses an inline IP validation check (FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) that does not block CGNAT addresses (100.64.0.0/10, RFC 6598). The includes/ssrf_helper.php file explicitly defines is_cgnat_ip() to cover this gap (used by notification endpoints), but the logo/icon URL fetching in subscription and payment endpoints performs its own inline validation that misses this range. This allows authenticated users to perform Blind SSRF to internal services in Tailscale, Carrier-Grade NAT, and other environments using 100.64.0.0/10 addresses. This issue has been patched in version 4.8.1. Severity: 0.0 | NA Visit the link for more details, such as CVSS details, affected products, timeline, and more...

CVE Details

Published
May 7, 2026
Affected Product: php
Impact: SSRF