CVE-2026-43921

HIGHPre-NVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% 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
8.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.9Exploit: 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 0.6.10 through 0.7.2 have a PHP code injection vulnerability in FOSSBilling's Config::prettyPrintArrayToPHP() method. When configuration values are updated, string values are written into config.php without escaping single quotes. Because config.php is loaded via a bare include on every HTTP request, an attacker with admin privileges can inject arbitrary PHP code that executes on every subsequent request. Version 0.8.0 contains a patch. Some workarounds are available. Restrict admin access to trusted personnel only; audit config.php for unexpected PHP code; and/ or at the reverse proxy/WAF level, restrict access to admin API endpoints that modify configuration.

CVSS v3
8.9
EG Score
8.9(medium)
EPSS
19.3%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 7, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
Patch available. Sources: github.
github Patch Available

Arbitrary PHP code injection via unescaped config serialization · Advisory · FOSSBilling/FOSSBilling · GitHub

https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-v4j9-w6pj-38w5

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 28× 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. 2026-07-16 00:07 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 11:17 UTCEG score recompute
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 22:26 UTCEG score recompute
  6. 2026-07-14 09:36 UTCEG score recompute
  7. 2026-07-13 22:30 UTCEPSS rescore
  8. 2026-07-13 20:47 UTCEG score recompute
  9. 2026-07-13 07:57 UTCEG score recompute
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-12 19:07 UTCEG score recompute
  12. 2026-07-12 06:18 UTCEG score recompute
  13. 2026-07-12 05:46 UTCEPSS rescore
  14. 2026-07-11 17:23 UTCEG score recompute
  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-11 04:34 UTCEG score recompute
  17. 2026-07-10 15:45 UTCEG score recompute
  18. 2026-07-10 02:55 UTCEG score recompute
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 14:03 UTCEG score recompute
  21. 2026-07-09 01:13 UTCEG score recompute
  22. 2026-07-08 15:16 UTCEPSS rescore
  23. 2026-07-08 12:22 UTCEG score recompute
  24. 2026-07-07 23:30 UTCEG score recompute
  25. 2026-07-07 13:46 UTCEPSS rescore
Show 3 more
  1. 2026-07-07 10:41 UTCEG score recompute
  2. 2026-07-06 21:45 UTCEG score recompute
  3. 2026-07-06 21:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43921?
CVE-2026-43921 is a high vulnerability published on July 6, 2026. FOSSBilling is a free, open-source billing and client management system. Versions 0.6.10 through 0.7.2 have a PHP code injection vulnerability in FOSSBilling's Config::prettyPrintArrayToPHP() method. When configuration values are updated, string values are written into config.php without escaping…
When was CVE-2026-43921 disclosed?
CVE-2026-43921 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-2026-43921 actively exploited?
CVE-2026-43921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43921?
CVE-2026-43921 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2026-43921?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43921, 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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