CVE-2026-90927

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

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

filebrowser through 2.63.23 fails to limit WebSocket message size in the /api/command handler before checking permissions, allowing authenticated users to buffer arbitrarily large messages. Attackers can send oversized WebSocket messages to exhaust server heap memory and cause denial of service regardless of EnableExec setting or Execute permission.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
45
EG Risk 45/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 14, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No fix on record yet. Sources: github.
Web page

filebrowser through 2.63.23 Denial of Service via unbounded WebSocket message | Advisories | VulnCheck

https://www.vulncheck.com/advisories/filebrowser-through-2.63.23-denial-of-service-via-unbounded-websocket-message
GitHub advisoryMentions a patch (unverified)

Command WebSocket buffers unbounded messages before checking permissions · Advisory · filebrowser/filebrowser · GitHub

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p

Vendor Advisories for CVE-2026-90927(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 23× in last 7d / 81× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-11 19:13 UTCEG score recompute
  2. 2026-10-11 16:30 UTCEG score recompute
  3. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-11 13:45 UTCEG score recompute
  5. 2026-10-10 22:59 UTCEG score recompute
  6. 2026-10-10 22:59 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-09 22:14 UTCEG score recompute
  9. 2026-10-09 22:14 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  10. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-08 22:58 UTCEG score recompute
  12. 2026-10-08 22:58 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  13. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-07 20:12 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  16. 2026-10-06 21:05 UTCEG score recompute
  17. 2026-10-06 21:05 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-05 21:56 UTCEG score recompute
  20. 2026-10-05 21:56 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  21. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-04 21:58 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  24. 2026-10-03 22:51 UTCEG score recompute
  25. 2026-10-03 22:51 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
Show 56 more
  1. 2026-10-02 23:44 UTCEG score recompute
  2. 2026-10-02 23:43 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  3. 2026-10-02 00:18 UTCEG score recompute
  4. 2026-10-02 00:18 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  5. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-01 00:46 UTCEG score recompute
  7. 2026-10-01 00:46 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  8. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-09-30 01:31 UTCEG score recompute
  10. 2026-09-30 01:31 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  11. 2026-09-28 18:34 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  12. 2026-09-27 19:15 UTCEG score recompute
  13. 2026-09-27 19:15 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  14. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-09-26 20:07 UTCEG score recompute
  16. 2026-09-26 20:07 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-09-25 20:57 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  19. 2026-09-24 20:35 UTCEG score recompute
  20. 2026-09-24 20:35 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  21. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-09-24 08:25 UTCEG score recompute
  23. 2026-09-24 08:25 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  25. 2026-09-23 09:18 UTCEG score recompute
  26. 2026-09-23 09:18 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  27. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  28. 2026-09-22 10:11 UTCEG score recompute
  29. 2026-09-22 10:10 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  30. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  31. 2026-09-21 11:03 UTCEG score recompute
  32. 2026-09-21 11:03 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  33. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  34. 2026-09-20 11:56 UTCEG score recompute
  35. 2026-09-20 11:56 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  36. 2026-09-19 12:49 UTCEG score recompute
  37. 2026-09-19 12:49 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  39. 2026-09-18 13:43 UTCEG score recompute
  40. 2026-09-18 13:43 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  41. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  42. 2026-09-17 14:36 UTCEG score recompute
  43. 2026-09-17 14:36 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  44. 2026-09-16 15:29 UTCEG score recompute
  45. 2026-09-16 15:29 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  46. 2026-09-16 15:06 UTCEG score recompute
  47. 2026-09-16 15:06 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  48. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  49. 2026-09-16 11:42 UTCEG score recompute
  50. 2026-09-16 11:42 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  51. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  52. 2026-09-15 12:35 UTCEG score recompute
  53. 2026-09-15 12:35 UTCGHSA enrichmentGHSA-9f2h-f5v4-r5qq · GitHub severity HIGH · GitHub CVSS 6.5
  54. 2026-09-14 13:28 UTCEG score recompute
  55. 2026-09-14 13:00 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  56. 2026-09-14 12:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90927?
CVE-2026-90927 is a medium-severity vulnerability; its CVE record was published on September 14, 2026. filebrowser through 2.63.23 fails to limit WebSocket message size in the /api/command handler before checking permissions, allowing authenticated users to buffer arbitrarily large messages. Attackers can send oversized WebSocket messages to exhaust server heap memory and cause denial of service…
When was CVE-2026-90927 made public?
CVE-2026-90927 was made public on August 31, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 14, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-90927 actively exploited?
CVE-2026-90927 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90927?
CVE-2026-90927 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-90927?
No fix for CVE-2026-90927 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-90927 are linked in the Vendor Advisories panel on this page.

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