CVE-2026-54336

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (25th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
5.4EG
EchelonGraph verdictPlan a fixRemediate 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: 0.3%CVSS: 5.4Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath() in pkg/srvconn/sftp_asset.go to resolve paths outside the intended SFTP root and permit read, list, write, rename, or delete operations under the configured backend account on that asset. This issue is fixed in version 4.10.17.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

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)
Severity54% × 45%
The EG Score, 5.4 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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
25th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

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

August 17, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v4.10.17

Patch available: jumpserver/koko v4.10.17

https://github.com/jumpserver/koko/releases/tag/v4.10.17
GitHub commit

commit 02fabebe27da (jumpserver/koko)

Fix landed in jumpserver/koko commit 02fabebe27da — awaiting tagged release

https://github.com/jumpserver/koko/commit/02fabebe27dacce89114fba122c667a946fd12ea
GitHub advisoryMentions a patch (unverified)

KoKo Web Terminal SFTP Path Traversal on Authorized Asset · Advisory · jumpserver/jumpserver · GitHub

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-x6rg-36j6-76vr

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 47× 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. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-10-07 08:51 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  14. 2026-10-06 09:01 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-10-03 17:46 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-10-02 08:38 UTCEG score recompute
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-10-01 09:18 UTCEG score recompute
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-09-30 09:58 UTCEG score recompute
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 71 more
  1. 2026-09-29 06:44 UTCEG score recompute
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-09-28 07:24 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  5. 2026-09-27 08:04 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  7. 2026-09-25 01:58 UTCEG score recompute
  8. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-09-23 20:27 UTCEG score recompute
  10. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-09-22 20:38 UTCEG score recompute
  12. 2026-09-20 20:37 UTCEG score recompute
  13. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-09-19 21:16 UTCEG score recompute
  15. 2026-09-18 21:55 UTCEG score recompute
  16. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-09-17 22:27 UTCEG score recompute
  18. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-09-16 23:04 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-09-15 19:12 UTCEG score recompute
  23. 2026-09-13 19:00 UTCEG score recompute
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-12 19:38 UTCEG score recompute
  26. 2026-09-11 20:17 UTCEG score recompute
  27. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  28. 2026-09-10 20:47 UTCEG score recompute
  29. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  30. 2026-09-09 03:36 UTCEG score recompute
  31. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  32. 2026-09-07 04:41 UTCEG score recompute
  33. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  34. 2026-09-06 04:30 UTCEG score recompute
  35. 2026-09-05 05:09 UTCEG score recompute
  36. 2026-09-04 05:48 UTCEG score recompute
  37. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  38. 2026-09-03 05:49 UTCEG score recompute
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  40. 2026-09-02 06:04 UTCEG score recompute
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  42. 2026-09-01 06:29 UTCEG score recompute
  43. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  44. 2026-08-31 07:05 UTCEG score recompute
  45. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  46. 2026-08-30 07:44 UTCEG score recompute
  47. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  48. 2026-08-29 08:24 UTCEG score recompute
  49. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  50. 2026-08-28 09:03 UTCEG score recompute
  51. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  52. 2026-08-27 09:31 UTCEG score recompute
  53. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  54. 2026-08-26 10:11 UTCEG score recompute
  55. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  56. 2026-08-25 10:48 UTCEG score recompute
  57. 2026-08-24 11:28 UTCEG score recompute
  58. 2026-08-23 12:07 UTCEG score recompute
  59. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  60. 2026-08-22 12:47 UTCEG score recompute
  61. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  62. 2026-08-21 13:26 UTCEG score recompute
  63. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  64. 2026-08-20 14:01 UTCEG score recompute
  65. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  66. 2026-08-18 14:51 UTCEG score recompute
  67. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  68. 2026-08-18 13:27 UTCEG score recompute
  69. 2026-08-17 21:30 UTCEG score recompute
  70. 2026-08-17 21:05 UTCEG score recomputeFirst assessed: 5.4 MEDIUM
  71. 2026-08-17 21:04 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54336?
CVE-2026-54336 is a medium-severity vulnerability; its CVE record was published on August 17, 2026. JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath()…
When was the CVE record for CVE-2026-54336 published?
The CVE record for CVE-2026-54336 was published on August 17, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-54336 actively exploited?
CVE-2026-54336 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54336?
CVE-2026-54336 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54336?
A fix for CVE-2026-54336 is available: update to the fixed version the vendor names in its advisory.

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