CVE-2026-27708

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% 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
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: 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. In versions 0.7.2 and prior, the Servicecustom Client API's __call method accepts an order_id parameter and fetches the associated order without verifying the authenticated client owns it, potentially exposing cross-client data through IDOR. An authenticated client can access any other client's custom service by guessing sequential order IDs. This can lead to a confidentiality breach — attackers can read client PII (name, email, phone, address, company details, VAT number) and service configuration data belonging to other clients. This issue has been fixed in version 0.8.0.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
18.0%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (2)

Auto-updated Jun 24, 2026
Patch available. Sources: github_release, github.
github Patch Available

IDOR in Servicecustom client API allows cross-client data access · Advisory · FOSSBilling/FOSSBilling · GitHub

https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-p36w-9x66-488j
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(3)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 65× 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. 2026-07-13 01:16 UTCEG score recompute
  2. 2026-07-12 14:14 UTCEG score recompute
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-12 03:04 UTCEG score recompute
  5. 2026-07-11 16:00 UTCEG score recompute
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-11 04:57 UTCEG score recompute
  8. 2026-07-10 17:55 UTCEG score recompute
  9. 2026-07-10 06:52 UTCEG score recompute
  10. 2026-07-09 19:51 UTCEG score recompute
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-09 08:49 UTCEG score recompute
  13. 2026-07-08 21:46 UTCEG score recompute
  14. 2026-07-08 15:15 UTCEPSS rescore
  15. 2026-07-08 10:45 UTCEG score recompute
  16. 2026-07-07 23:43 UTCEG score recompute
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 12:41 UTCEG score recompute
  19. 2026-07-07 01:39 UTCEG score recompute
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 14:37 UTCEG score recompute
  23. 2026-07-06 03:34 UTCEG score recompute
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-06 02:23 UTCEPSS rescore
Show 40 more
  1. 2026-07-05 16:32 UTCEG score recompute
  2. 2026-07-05 05:23 UTCEG score recompute
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-04 18:20 UTCEG score recompute
  5. 2026-07-04 07:15 UTCEG score recompute
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-03 20:06 UTCEG score recompute
  9. 2026-07-03 09:04 UTCEG score recompute
  10. 2026-07-02 22:02 UTCEG score recompute
  11. 2026-07-02 11:00 UTCEG score recompute
  12. 2026-07-01 23:30 UTCEG score recompute
  13. 2026-07-01 15:06 UTCEPSS rescore
  14. 2026-07-01 15:06 UTCEPSS rescore
  15. 2026-07-01 12:28 UTCEG score recompute
  16. 2026-07-01 01:26 UTCEG score recompute
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-30 14:24 UTCEG score recompute
  20. 2026-06-30 03:20 UTCEG score recompute
  21. 2026-06-29 16:18 UTCEG score recompute
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 05:16 UTCEG score recompute
  24. 2026-06-28 18:13 UTCEG score recompute
  25. 2026-06-28 14:07 UTCEPSS rescore
  26. 2026-06-28 14:07 UTCEPSS rescore
  27. 2026-06-28 07:09 UTCEG score recompute
  28. 2026-06-28 04:56 UTCEPSS rescore
  29. 2026-06-28 04:56 UTCEPSS rescore
  30. 2026-06-27 20:06 UTCEG score recompute
  31. 2026-06-27 09:04 UTCEG score recompute
  32. 2026-06-27 03:08 UTCEPSS rescore
  33. 2026-06-26 22:02 UTCEG score recompute
  34. 2026-06-26 11:00 UTCEG score recompute
  35. 2026-06-25 20:07 UTCEG score recompute
  36. 2026-06-25 13:49 UTCEPSS rescore
  37. 2026-06-25 13:49 UTCEPSS rescore
  38. 2026-06-25 09:05 UTCEG score recompute
  39. 2026-06-24 22:03 UTCEG score recompute
  40. 2026-06-24 22:03 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-27708?
CVE-2026-27708 is a high vulnerability published on June 24, 2026. FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, the Servicecustom Client API's call method accepts an order_id parameter and fetches the associated order without verifying the authenticated client owns it, potentially exposing cross-client data…
When was CVE-2026-27708 disclosed?
CVE-2026-27708 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27708 actively exploited?
CVE-2026-27708 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27708?
CVE-2026-27708 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-27708?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27708, 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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