CVE-2026-43926

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% 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, secondary
6.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.3Exploit: NoneExposed: 0

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

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the password reset confirmation endpoint /client/reset-password-confirm/:hash is handled by a non-API controller and is not covered by FOSSBilling's rate limiter, which only applies to /api/* routes. This allows an attacker to probe the endpoint for valid reset tokens without any per-IP request limiting, attempt counting, or lockout mechanism. The endpoint acts as an oracle, returning a distinguishable response for valid versus invalid tokens (HTTP 200 vs HTTP 302 redirect). An attacker can submit unlimited token guesses to the password reset confirmation endpoint with no throttling applied. However, practical exploitability is significantly mitigated by the current token generation, which uses hash('sha256', random_bytes(32)), providing 256 bits of entropy. Tokens also expire after 15 minutes and are deleted after successful use. The same architectural gap applies to other controller-served auth routes, including /staff/email/:hash (admin password reset confirmation) and /client/confirm-email/:hash (email confirmation). Version 0.8.0 fixes the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the /client/reset-password-confirm/* and /staff/email/* paths and/or use a WAF rule to limit request rates to these endpoints.

CVSS v3
6.3
EG Score
6.3(medium)
EPSS
12.1%
KEV
Not listed

Published

June 4, 2026

Last Modified

June 4, 2026

Advisory Details (2)

Auto-updated Jun 16, 2026
Patch available. Sources: github_release, github.
github Patch Available

Password reset confirmation endpoint lacks rate limiting · Advisory · FOSSBilling/FOSSBilling · GitHub

https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-cqqm-p3x5-9fqg
github_release Patch Available

0.8.0

Patch available: FOSSBilling/FOSSBilling 0.8.0

https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.0

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 52× 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. 2026-07-11 12:20 UTCEG score recompute
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-08 10:09 UTCEG score recompute
  6. 2026-07-07 13:46 UTCEPSS rescore
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-03 23:33 UTCEG score recompute
  12. 2026-07-02 22:03 UTCEG score recompute
  13. 2026-07-01 21:13 UTCEG score recompute
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-06-30 20:23 UTCEG score recompute
  16. 2026-06-29 19:26 UTCEG score recompute
  17. 2026-06-29 14:06 UTCEPSS rescore
  18. 2026-06-28 16:40 UTCEG score recompute
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 15:49 UTCEG score recompute
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 14:59 UTCEG score recompute
  24. 2026-06-25 13:49 UTCEPSS rescore
  25. 2026-06-25 13:49 UTCEPSS rescore
Show 46 more
  1. 2026-06-25 09:57 UTCEG score recompute
  2. 2026-06-24 14:05 UTCEPSS rescore
  3. 2026-06-24 09:06 UTCEG score recompute
  4. 2026-06-23 21:33 UTCEPSS rescore
  5. 2026-06-23 02:28 UTCEG score recompute
  6. 2026-06-22 14:25 UTCEPSS rescore
  7. 2026-06-22 14:25 UTCEPSS rescore
  8. 2026-06-21 14:56 UTCEPSS rescore
  9. 2026-06-21 14:56 UTCEPSS rescore
  10. 2026-06-21 01:59 UTCEPSS rescore
  11. 2026-06-20 12:13 UTCEG score recompute
  12. 2026-06-19 19:25 UTCEPSS rescore
  13. 2026-06-19 02:38 UTCEG score recompute
  14. 2026-06-18 17:52 UTCEPSS rescore
  15. 2026-06-18 17:52 UTCEPSS rescore
  16. 2026-06-18 01:26 UTCEG score recompute
  17. 2026-06-17 17:53 UTCEPSS rescore
  18. 2026-06-17 00:37 UTCEG score recompute
  19. 2026-06-16 17:52 UTCEPSS rescore
  20. 2026-06-15 23:46 UTCEG score recompute
  21. 2026-06-15 17:49 UTCEPSS rescore
  22. 2026-06-14 22:57 UTCEG score recompute
  23. 2026-06-13 23:00 UTCEPSS rescore
  24. 2026-06-13 22:08 UTCEG score recompute
  25. 2026-06-12 23:12 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 21:19 UTCEG score recompute
  28. 2026-06-11 20:29 UTCEG score recompute
  29. 2026-06-11 14:00 UTCEPSS rescore
  30. 2026-06-10 22:18 UTCEPSS rescore
  31. 2026-06-10 19:40 UTCEG score recompute
  32. 2026-06-10 13:22 UTCEPSS rescore
  33. 2026-06-10 13:22 UTCEPSS rescore
  34. 2026-06-09 18:51 UTCEG score recompute
  35. 2026-06-08 18:02 UTCEG score recompute
  36. 2026-06-08 14:17 UTCEPSS rescore
  37. 2026-06-08 14:17 UTCEPSS rescore
  38. 2026-06-07 16:00 UTCEG score recompute
  39. 2026-06-07 15:25 UTCEPSS rescore
  40. 2026-06-07 15:25 UTCEPSS rescore
  41. 2026-06-06 15:10 UTCEG score recompute
  42. 2026-06-06 13:47 UTCEPSS rescore
  43. 2026-06-06 13:47 UTCEPSS rescore
  44. 2026-06-05 22:47 UTCEPSS rescore
  45. 2026-06-05 14:20 UTCEG score recompute
  46. 2026-06-04 13:31 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43926?
CVE-2026-43926 is a medium vulnerability published on June 4, 2026. FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the password reset confirmation endpoint /client/reset-password-confirm/:hash is handled by a non-API controller and is not covered by FOSSBilling's rate limiter, which only applies to /api/ routes.…
When was CVE-2026-43926 disclosed?
CVE-2026-43926 was first published in the National Vulnerability Database on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43926 actively exploited?
CVE-2026-43926 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43926?
CVE-2026-43926 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-43926?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43926, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-43926

Explore →

Is Your Infrastructure Affected by CVE-2026-43926?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs