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.
Published: 2026-05-07
Score: 4.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability allows authenticated users to cause the application to fetch URLs that resolve to 100.64.0.0/10 addresses. This range is used for Carrier‑Grade NAT and other internal networks, so the attacker can reach internal services by supplying a URL that resolves to such an address. The result is a blind SSRF that can expose sensitive internal endpoints. The weakness is a missing check for the CGNAT range and corresponds to CWE-918, "Server‑Side Request Forgery".

Affected Systems

All installations of Wallos before version 4.8.1 are affected, including the main application, subscription processing, and payment handling modules. The product is provided by Ellite and is used as a self‑hosted personal subscription tracker. Version 4.8.1 and later contain the fix.

Risk and Exploitability

The CVSS score of 4.3 indicates moderate impact. The EPSS score is not available, but the lack of a public KEV listing suggests that exploitation is not widespread yet. The attack requires user authentication and the ability to submit subscription or payment data. An attacker can therefore trigger the SSRF through legitimate user actions, with the potential to reach internal services behind CGNAT addresses. The weaknesses in input validation (FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) make the issue straightforward to exploit for an authenticated user, though the scope is limited to internal network resources.

Generated by OpenCVE AI on May 7, 2026 at 15:06 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade Wallos to version 4.8.1 or later to apply the patch that adds CGNAT checks to logo URL fetching
  • If an upgrade is not immediately possible, restrict outbound HTTP(S) from the subscription‑added endpoints by blocking destinations in the 100.64.0.0/10 range at the application or network level
  • Configure network firewalls or reverse proxies to prevent the server from accessing internal hosts on the 100.64.0.0/10 network, thereby mitigating the blind SSRF impact
  • Monitor access logs and outbound request logs for unexpected connections to internal networks to detect any malicious use of the vulnerability

Generated by OpenCVE AI on May 7, 2026 at 15:06 UTC.

Tracking

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Advisories

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History

Thu, 07 May 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Ellite
Ellite wallos
Vendors & Products Ellite
Ellite wallos

Thu, 07 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 07 May 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title Wallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not Used in Inline Checks
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Subscriptions

Ellite Wallos
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-07T14:56:55.979Z

Reserved: 2026-04-22T03:53:24.407Z

Link: CVE-2026-41687

cve-icon Vulnrichment

Updated: 2026-05-07T14:56:52.146Z

cve-icon NVD

Status : Deferred

Published: 2026-05-07T15:16:09.107

Modified: 2026-05-07T16:16:20.470

Link: CVE-2026-41687

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-07T16:30:15Z

Weaknesses