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

Quick assessment

Affected
ellite Wallos
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 4.3 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1598.001 · Spearphishing Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
ellite Wallos < 4.8.1 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
ellite Wallos < 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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Vendor Advisories for CVE-2026-41687 (1)

Vendor Pages for CVE-2026-41687 (1)

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

CVE-2026-41688 7.7 HIGH Incomplete fix for CVE-2026-33399: SSRF in Wallos
CVE-2026-41689 6.0 MEDIUM Wallos: 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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