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CVE-2026-41687— Wallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not Used in Inline Checks

CVSS 4.3 · Medium EPSS 0.03% · P8
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I. Basic Information for CVE-2026-41687

Vulnerability Information
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Vulnerability Title
Wallos: SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not Used in Inline Checks
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Wallos 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wallos是Miguel Ribeiro个人开发者的一个开源个人订阅跟踪器。 Wallos 4.8.1之前版本存在代码问题漏洞，该漏洞源于SSRF保护机制未阻止CGNAT地址范围，可能导致经过身份验证的用户对内部服务进行盲SSRF攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
elliteWallos < 4.8.1 -

II. Public POCs for CVE-2026-41687

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III. Intelligence Information for CVE-2026-41687

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Same Patch Batch · ellite · 2026-05-07 · 3 CVEs total

CVE-2026-416887.7 HIGHIncomplete fix for CVE-2026-33399: SSRF in Wallos
CVE-2026-416896.0 MEDIUMWallos: Shared local webhook allowlist lets low-privilege users send arbitrary requests to

IV. Related Vulnerabilities

Same product: Wallos
Same vendor: ellite
Same weakness: CWE-918

V. Comments for CVE-2026-41687

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