PT-2026-38444 · Ellite · Wallos

Published 2026-05-07 · Updated 2026-05-07 · CVE-2026-41687

NVD

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-41687

Affected Products

Wallos

References · 4

• 🔥 https://github.com/ellite/Wallos/security/advisories/GHSA-4v59-hghw-7gc2 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-41687 · Security Note
• https://github.com/ellite/Wallos/releases/tag/v4.8.1 · Note
• https://github.com/ellite/Wallos/commit/e79f28be6be0435fbc93563fb3c0e62206b48e85 · Note