CVE-2026-90823

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-17. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

FatPipe MPVPN, WARP, and IPVPN appliances running the end-of-life firmware version 10.1.2r60p100 contain a stack-based buffer overflow in /usr/sbin/auth_user_pass. An unauthenticated remote attacker with access to the affected management interface can submit a crafted authentication request that reaches an unchecked copy into a fixed-size stack buffer, potentially allowing arbitrary code execution as root.

The affected management interface is disabled by default and must be affirmatively enabled by the customer before the endpoint becomes reachable. FatPipe recommends restricting management access to trusted administrative networks and using WAN access control lists to limit access to trusted sources.

Customers running the affected end-of-life firmware can contact FatPipe Support for help confirming their firmware version and upgrading to a current supported release at https://www.fatpipeinc.com/support/support, [email protected], or +1 800-724-8521 (option 3).

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
65%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

ADVISORIES – Securifera

https://www.securifera.com/advisories/
generic

Support

https://www.fatpipeinc.com/support/support

Vendor Advisories for CVE-2026-90823(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 59× in last 7d / 73× 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. 2026-09-25 12:18 UTCGHSA enrichment
  2. 2026-09-25 08:39 UTCGHSA enrichment
  3. 2026-09-25 05:00 UTCGHSA enrichment
  4. 2026-09-25 01:22 UTCGHSA enrichment
  5. 2026-09-24 21:43 UTCGHSA enrichment
  6. 2026-09-24 18:04 UTCGHSA enrichment
  7. 2026-09-24 14:17 UTCEG score recompute
  8. 2026-09-24 14:17 UTCGHSA enrichment
  9. 2026-09-24 14:04 UTCEPSS rescore
  10. 2026-09-24 10:38 UTCGHSA enrichment
  11. 2026-09-24 06:58 UTCGHSA enrichment
  12. 2026-09-24 03:19 UTCGHSA enrichment
  13. 2026-09-23 23:40 UTCGHSA enrichment
  14. 2026-09-23 20:02 UTCEG score recompute
  15. 2026-09-23 20:02 UTCGHSA enrichment
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-23 16:23 UTCGHSA enrichment
  18. 2026-09-23 12:44 UTCGHSA enrichment
  19. 2026-09-23 09:05 UTCGHSA enrichment
  20. 2026-09-23 05:26 UTCGHSA enrichment
  21. 2026-09-23 01:47 UTCGHSA enrichment
  22. 2026-09-22 22:08 UTCGHSA enrichment
  23. 2026-09-22 18:29 UTCEG score recompute
  24. 2026-09-22 18:29 UTCGHSA enrichment
  25. 2026-09-22 16:01 UTCEPSS rescore
Show 48 more
  1. 2026-09-22 14:51 UTCGHSA enrichment
  2. 2026-09-22 11:12 UTCGHSA enrichment
  3. 2026-09-22 07:34 UTCGHSA enrichment
  4. 2026-09-22 03:54 UTCGHSA enrichment
  5. 2026-09-22 00:15 UTCEG score recompute
  6. 2026-09-22 00:15 UTCGHSA enrichment
  7. 2026-09-21 21:09 UTCEPSS rescore
  8. 2026-09-21 20:36 UTCGHSA enrichment
  9. 2026-09-21 16:57 UTCGHSA enrichment
  10. 2026-09-21 13:18 UTCGHSA enrichment
  11. 2026-09-21 09:39 UTCGHSA enrichment
  12. 2026-09-21 06:00 UTCGHSA enrichment
  13. 2026-09-21 02:21 UTCGHSA enrichment
  14. 2026-09-20 22:42 UTCEG score recompute
  15. 2026-09-20 22:42 UTCGHSA enrichment
  16. 2026-09-20 20:16 UTCEPSS rescore
  17. 2026-09-20 19:03 UTCGHSA enrichment
  18. 2026-09-20 15:22 UTCGHSA enrichment
  19. 2026-09-20 11:43 UTCGHSA enrichment
  20. 2026-09-20 07:59 UTCGHSA enrichment
  21. 2026-09-20 04:19 UTCGHSA enrichment
  22. 2026-09-20 00:40 UTCGHSA enrichment
  23. 2026-09-19 21:01 UTCGHSA enrichment
  24. 2026-09-19 17:22 UTCEG score recompute
  25. 2026-09-19 17:22 UTCGHSA enrichment
  26. 2026-09-19 13:43 UTCGHSA enrichment
  27. 2026-09-19 10:04 UTCGHSA enrichment
  28. 2026-09-19 06:25 UTCGHSA enrichment
  29. 2026-09-19 02:46 UTCGHSA enrichment
  30. 2026-09-18 23:07 UTCEG score recompute
  31. 2026-09-18 23:07 UTCGHSA enrichment
  32. 2026-09-18 19:28 UTCEPSS rescore
  33. 2026-09-18 19:28 UTCGHSA enrichment
  34. 2026-09-18 16:12 UTCGHSA enrichment
  35. 2026-09-18 12:33 UTCGHSA enrichment
  36. 2026-09-18 08:54 UTCGHSA enrichment
  37. 2026-09-18 05:15 UTCGHSA enrichment
  38. 2026-09-18 01:36 UTCGHSA enrichment
  39. 2026-09-17 21:57 UTCGHSA enrichment
  40. 2026-09-17 18:18 UTCEG score recompute
  41. 2026-09-17 18:18 UTCGHSA enrichment
  42. 2026-09-17 14:19 UTCEG score recompute
  43. 2026-09-17 14:19 UTCGHSA enrichment
  44. 2026-09-17 13:21 UTCEG score recompute
  45. 2026-09-17 13:21 UTCGHSA enrichment
  46. 2026-09-17 12:20 UTCEG score recompute
  47. 2026-09-17 12:10 UTCEG score recompute
  48. 2026-09-17 12:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90823?
CVE-2026-90823 is a critical vulnerability published on September 17, 2026. FatPipe MPVPN, WARP, and IPVPN appliances running the end-of-life firmware version 10.1.2r60p100 contain a stack-based buffer overflow in /usr/sbin/authuserpass. An unauthenticated remote attacker with access to the affected management interface can submit a crafted authentication request that…
When was CVE-2026-90823 disclosed?
CVE-2026-90823 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90823 actively exploited?
CVE-2026-90823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 34.8% of all scored CVEs.
What is the CVSS score of CVE-2026-90823?
CVE-2026-90823 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-90823?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90823, 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

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