CVE-2026-42341

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% 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
9.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.2Exploit: 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. Versions 0.6.0 through 0.7.2 have an unauthenticated payment bypass vulnerability in FOSSBilling's IPN callback endpoint. When the Custom payment adapter is enabled, an attacker can mark any unpaid invoice as paid and credit the associated client account without making an actual payment, by sending a single crafted HTTP request. Version 0.8.0 patches the issue. Some workarounds are available. Disable the Custom payment gateway if not actively needed and/or restrict access to /ipn.php at the web server level (e.g., via IP allowlisting), noting that this may interfere with legitimate payment callback processing.

CVSS v3
9.2
EG Score
9.2(medium)
EPSS
8.1%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 7, 2026

Advisory Details (1)

Auto-updated Jul 6, 2026
Patch available. Sources: github.
github Patch Available

Unauthenticated payment bypass via IPN callback forgery · Advisory · FOSSBilling/FOSSBilling · GitHub

https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-5493-9m76-2qrr

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 37× in last 7d / 37× 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. 2026-07-12 07:37 UTCEG score recompute
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-12 03:17 UTCEG score recompute
  4. 2026-07-11 22:57 UTCEG score recompute
  5. 2026-07-11 18:37 UTCEG score recompute
  6. 2026-07-11 14:17 UTCEG score recompute
  7. 2026-07-11 09:56 UTCEG score recompute
  8. 2026-07-11 08:27 UTCEPSS rescore
  9. 2026-07-11 05:36 UTCEG score recompute
  10. 2026-07-11 01:16 UTCEG score recompute
  11. 2026-07-10 20:55 UTCEG score recompute
  12. 2026-07-10 16:36 UTCEG score recompute
  13. 2026-07-10 12:13 UTCEG score recompute
  14. 2026-07-10 07:53 UTCEG score recompute
  15. 2026-07-10 03:33 UTCEG score recompute
  16. 2026-07-09 23:11 UTCEG score recompute
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 18:50 UTCEG score recompute
  19. 2026-07-09 14:30 UTCEG score recompute
  20. 2026-07-09 10:06 UTCEG score recompute
  21. 2026-07-09 05:46 UTCEG score recompute
  22. 2026-07-09 01:25 UTCEG score recompute
  23. 2026-07-08 21:02 UTCEG score recompute
  24. 2026-07-08 16:42 UTCEG score recompute
  25. 2026-07-08 15:15 UTCEPSS rescore
Show 12 more
  1. 2026-07-08 12:22 UTCEG score recompute
  2. 2026-07-08 07:59 UTCEG score recompute
  3. 2026-07-08 03:39 UTCEG score recompute
  4. 2026-07-07 23:20 UTCEG score recompute
  5. 2026-07-07 18:59 UTCEG score recompute
  6. 2026-07-07 14:39 UTCEG score recompute
  7. 2026-07-07 13:46 UTCEPSS rescore
  8. 2026-07-07 10:16 UTCEG score recompute
  9. 2026-07-07 05:45 UTCEG score recompute
  10. 2026-07-07 01:25 UTCEG score recompute
  11. 2026-07-06 21:05 UTCEG score recompute
  12. 2026-07-06 21:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-42341?
CVE-2026-42341 is a critical vulnerability published on July 6, 2026. FOSSBilling is a free, open-source billing and client management system. Versions 0.6.0 through 0.7.2 have an unauthenticated payment bypass vulnerability in FOSSBilling's IPN callback endpoint. When the Custom payment adapter is enabled, an attacker can mark any unpaid invoice as paid and credit…
When was CVE-2026-42341 disclosed?
CVE-2026-42341 was first published in the National Vulnerability Database on July 6, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42341 actively exploited?
CVE-2026-42341 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42341?
CVE-2026-42341 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-42341?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42341, 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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