CVE-2026-41687

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

May 7, 2026

Last Modified

May 7, 2026

Advisory Details (3)

Auto-updated Jun 17, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

SSRF CGNAT Bypass in subscription/payments Logo URL — is_cgnat_ip() Not Used in Inline Checks (CWE-918) · Advisory · ellite/Wallos · GitHub

https://github.com/ellite/Wallos/security/advisories/GHSA-4v59-hghw-7gc2
github_release Patch Available

v4.8.1

Patch available: ellite/Wallos v4.8.1

https://github.com/ellite/Wallos/releases/tag/v4.8.1
github_commit Patch Available

commit e79f28be6be0 (ellite/Wallos)

Patch available: ellite/Wallos v4.8.1 (contains commit e79f28be6be0)

https://github.com/ellite/Wallos/commit/e79f28be6be0435fbc93563fb3c0e62206b48e85

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-24 14:17 UTCEPSS rescore
  5. 2026-07-23 14:18 UTCEPSS rescore
  6. 2026-07-23 03:11 UTCEG score recompute
  7. 2026-07-22 14:08 UTCEPSS rescore
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  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 10:49 UTCOSV refresh
  14. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  5. 2026-07-01 15:06 UTCEPSS rescore
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-29 14:06 UTCEPSS rescore
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-27 03:08 UTCEPSS rescore
  11. 2026-06-25 13:49 UTCEPSS rescore
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  13. 2026-06-24 14:05 UTCEPSS rescore
  14. 2026-06-23 21:33 UTCEPSS rescore
  15. 2026-06-22 14:25 UTCEPSS rescore
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  17. 2026-06-21 14:56 UTCEPSS rescore
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  19. 2026-06-21 01:59 UTCEPSS rescore
  20. 2026-06-19 19:25 UTCEPSS rescore
  21. 2026-06-18 17:52 UTCEPSS rescore
  22. 2026-06-18 17:52 UTCEPSS rescore
  23. 2026-06-16 17:52 UTCEPSS rescore
  24. 2026-06-15 17:49 UTCEPSS rescore
  25. 2026-06-13 23:00 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
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  34. 2026-06-07 15:25 UTCEPSS rescore
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  36. 2026-06-06 13:47 UTCEPSS rescore
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  41. 2026-06-04 13:12 UTCEPSS rescore
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  43. 2026-06-02 20:13 UTCEPSS rescore
  44. 2026-06-01 13:52 UTCEPSS rescore
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  47. 2026-05-31 22:30 UTCEPSS rescore
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  49. 2026-05-31 00:16 UTCEPSS rescore
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  52. 2026-05-29 13:44 UTCEPSS rescore
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  54. 2026-05-28 13:44 UTCEPSS rescore
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  60. 2026-05-26 13:44 UTCEPSS rescore
  61. 2026-05-26 07:18 UTCEPSS rescore
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  63. 2026-05-20 22:38 UTCEPSS rescore
  64. 2026-05-20 22:38 UTCEPSS rescore
  65. 2026-05-20 13:55 UTCEG score recompute
  66. 2026-05-20 11:22 UTCEPSS rescore
  67. 2026-05-20 11:22 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-41687?
CVE-2026-41687 is a medium vulnerability published on May 7, 2026. 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 (FILTERFLAGNOPRIVRANGE | FILTERFLAGNORESRANGE) that does not…
When was CVE-2026-41687 disclosed?
CVE-2026-41687 was first published in the National Vulnerability Database on May 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41687 actively exploited?
CVE-2026-41687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41687?
CVE-2026-41687 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-41687?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41687, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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