CVE-2026-55440

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (53rd 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

Also known asEUVD-2026-44947 (ENISA EUVD)Source: ENISA EUVD

6.5EG
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: 0.7%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Microsoft UFO open-source framework for intelligent automation across devices and platforms. Prior to 3.0.7, the COMMAND_RESULTS handler in ufo/server/ws/handler.py called get_or_create_session in ufo/server/services/session_manager.py without owner_client_id, allowing an authenticated client to create an unowned attacker-chosen session_id such as constellation_task_id = f"{task_name}@{task_id}" and deny the legitimate owner or exhaust memory with phantom sessions. This issue is fixed in version 3.0.7.

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

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
0.7%
EPSS %ILE
53rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

July 16, 2026

Last Modified

October 24, 2026

Advisory Details (3)

Auto-updated Jul 16, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

3.0.7

Patch available: microsoft/UFO 3.0.7

https://github.com/microsoft/UFO/releases/tag/3.0.7
GitHub commit Patch Available

commit cc653bde7533 (microsoft/UFO)

Patch available: microsoft/UFO 3.0.7 (contains commit cc653bde7533)

https://github.com/microsoft/UFO/commit/cc653bde75337ab60c320e6b7cb61b86ba6ca948
GitHub advisoryMentions a patch (unverified)

COMMAND_RESULTS handler creates unowned sessions, allowing authenticated session-squatting denial of service · Advisory · microsoft/UFO · GitHub

https://github.com/microsoft/UFO/security/advisories/GHSA-hxjv-fmjf-wmjf

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 40× 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.

Showing the most recent 100 of 145 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 45 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  4. 2026-10-25 14:18 UTCEG score recompute
  5. 2026-10-24 20:28 UTCEG score recompute
  6. 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  7. 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  8. 2026-10-22 21:16 UTCEG score recompute
  9. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  10. 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  11. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  14. 2026-10-18 03:30 UTCEG score recompute
  15. 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  16. 2026-10-16 16:42 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  17. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  18. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  20. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  21. 2026-10-12 15:55 UTCEG score recompute
  22. 2026-10-11 19:39 UTCEG score recompute
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  24. 2026-10-11 14:17 UTCEG score recompute
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.3% · 68th percentile
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  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  8. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  9. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  11. 2026-10-01 11:23 UTCEG score recompute
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  13. 2026-09-29 15:22 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  15. 2026-09-28 08:18 UTCEG score recompute
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  18. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  19. 2026-09-24 08:29 UTCEG score recompute
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  21. 2026-09-23 03:02 UTCEG score recompute
  22. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  24. 2026-09-18 04:38 UTCEG score recompute
  25. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  29. 2026-09-14 05:16 UTCEG score recompute
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  31. 2026-09-13 07:08 UTCEG score recompute
  32. 2026-09-11 21:41 UTCEG score recompute
  33. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  34. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  35. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  36. 2026-09-08 00:30 UTCEG score recompute
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  38. 2026-09-06 18:54 UTCEG score recompute
  39. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  40. 2026-09-05 20:39 UTCEG score recompute
  41. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  42. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  43. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  44. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  45. 2026-08-31 01:43 UTCEG score recompute
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  47. 2026-08-30 03:34 UTCEG score recompute
  48. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  49. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  50. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  51. 2026-08-27 12:31 UTCEG score recompute
  52. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  53. 2026-08-26 11:58 UTCEG score recompute
  54. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  55. 2026-08-24 14:50 UTCEG score recompute
  56. 2026-08-23 16:40 UTCEG score recompute
  57. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  58. 2026-08-22 18:32 UTCEG score recompute
  59. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  60. 2026-08-21 20:24 UTCEG score recompute
  61. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  62. 2026-08-19 23:55 UTCEG score recompute
  63. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  64. 2026-08-18 19:56 UTCEG score recompute
  65. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  66. 2026-08-17 14:55 UTCEG score recompute
  67. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  68. 2026-08-16 16:47 UTCEG score recompute
  69. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  70. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  71. 2026-08-15 18:39 UTCEG score recompute
  72. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  73. 2026-08-13 22:22 UTCEG score recompute
  74. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  75. 2026-08-13 00:14 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55440?
CVE-2026-55440 is a medium-severity vulnerability; its CVE record was published on July 16, 2026. Microsoft UFO open-source framework for intelligent automation across devices and platforms. Prior to 3.0.7, the COMMANDRESULTS handler in ufo/server/ws/handler.py called getorcreatesession in ufo/server/services/sessionmanager.py without ownerclientid, allowing an authenticated client to create an…
When was the CVE record for CVE-2026-55440 published?
The CVE record for CVE-2026-55440 was published on July 16, 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 October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-55440 actively exploited?
CVE-2026-55440 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55440?
CVE-2026-55440 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-2026-55440?
A fix for CVE-2026-55440 is available: update to the fixed version the vendor names in its advisory.

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