CVE-2026-41687: CWE-918: Server-Side Request Forgery (SSRF) in ellite Wallos
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.
AI Analysis
Technical Summary
Wallos, an open-source personal subscription tracker, had an SSRF vulnerability due to incomplete IP validation in endpoints/subscription/add.php and endpoints/payments/add.php. The inline validation used FILTER_FLAG_NO_PRIV_RANGE and FILTER_FLAG_NO_RES_RANGE but did not block the CGNAT address range 100.64.0.0/10. Although the is_cgnat_ip() function exists for other endpoints, it was not applied to logo/icon URL fetching in the affected endpoints. This allowed authenticated users to perform blind SSRF attacks targeting internal services accessible via CGNAT addresses. The vulnerability is fixed in Wallos version 4.8.1.
Potential Impact
An authenticated user can exploit this SSRF vulnerability to make the server send requests to internal network services within CGNAT or Tailscale environments. The CVSS score of 4.3 indicates a medium severity impact with limited confidentiality impact and no integrity or availability impact. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Wallos to version 4.8.1 or later, where this SSRF vulnerability has been patched. Since the vendor has released a fixed version, applying this official update is the recommended remediation. No additional mitigations are specified or required beyond applying the patch.
CVE-2026-41687: CWE-918: Server-Side Request Forgery (SSRF) in ellite Wallos
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wallos, an open-source personal subscription tracker, had an SSRF vulnerability due to incomplete IP validation in endpoints/subscription/add.php and endpoints/payments/add.php. The inline validation used FILTER_FLAG_NO_PRIV_RANGE and FILTER_FLAG_NO_RES_RANGE but did not block the CGNAT address range 100.64.0.0/10. Although the is_cgnat_ip() function exists for other endpoints, it was not applied to logo/icon URL fetching in the affected endpoints. This allowed authenticated users to perform blind SSRF attacks targeting internal services accessible via CGNAT addresses. The vulnerability is fixed in Wallos version 4.8.1.
Potential Impact
An authenticated user can exploit this SSRF vulnerability to make the server send requests to internal network services within CGNAT or Tailscale environments. The CVSS score of 4.3 indicates a medium severity impact with limited confidentiality impact and no integrity or availability impact. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Wallos to version 4.8.1 or later, where this SSRF vulnerability has been patched. Since the vendor has released a fixed version, applying this official update is the recommended remediation. No additional mitigations are specified or required beyond applying the patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-22T03:53:24.407Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fca37ecbff5d8610fd57ab
Added to database: 5/7/2026, 2:36:46 PM
Last enriched: 5/7/2026, 2:52:42 PM
Last updated: 5/8/2026, 9:23:12 PM
Views: 11
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