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TI-2026-30204 Aliases CVE-2026-41687

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

Priority MEDIUM 53CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00204 10th percentileScored 2026-11-07
Fix Fixed Wallos (ellite): 4.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
elliteWallosbefore 4.8.14.8.1Patch availableCNA
  • Wallos Vendorellite Affected before 4.8.1 Fixed in 4.8.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:wallosapp:wallos:*:*:*:*:*:*:*:*——ellite
  • cpe:2.3:a:wallosapp:wallos:*:*:*:*:*:*:*:* Versions — — ·ellite

Remediation

  • Fix · CNA Wallos (ellite) Fixed in 4.8.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41687

References

Other 3

  • TI-2026-53972 Server-side request forgery in ellite Wallos CVSS 3.1HIGH 8.2
  • TI-2026-39433 Wallos: Unauthenticated database replacement via import endpoint on fresh install CVSS 4.0HIGH 8.2
  • TI-2026-25804 Wallos: SSRF via HTTP Proxy Environment Variable CVSS 4.0HIGH 8.3
  • TI-2026-23669 Wallos: Server-Side Request Forgery (SSRF) in Notification Testers CVSS 3.0HIGH 8.8
  • TI-2026-39431 Missing Authentication for Critical Function in wallos CVSS 3.1HIGH 7.5
  • TI-2026-39432 Wallos: OIDC state parameter never validated — login CSRF / account takeover CVSS 4.0HIGH 7.5
See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences