CVE-2026-55761

MEDIUMNVD 5.95.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
5.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. In versions 2.39.0 through 2.39.3 and 2.40.0 until 2.43.0, unauthenticated restore and administrator initialization endpoints (/api/restore and /api/users/admin/init) remain accessible during the five-minute setup window for uninitialized instances, allowing a network attacker to restore a crafted backup or create the first administrator account and gain full administrative access. This issue is fixed in versions 2.39.4 and 2.43.0.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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)
Severity59% × 45%
The EG Score, 5.9 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (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 8, 2026

Last Modified

July 10, 2026

Advisory Details (6)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Unauthenticated Restore and Admin-Account-Creation Endpoints Allow Admin Takeover on Uninitialised Portainer Instances · Advisory · portainer/portainer · GitHub

https://github.com/portainer/portainer/security/advisories/GHSA-x626-fcwx-f5pc
GitHub release Patch Available

Release 2.43.0 STS

Patch available: portainer/portainer 2.43.0

https://github.com/portainer/portainer/releases/tag/2.43.0
GitHub release Patch Available

Release 2.39.4 LTS

Patch available: portainer/portainer 2.39.4

https://github.com/portainer/portainer/releases/tag/2.39.4
Web page

Add Endpoint Information to UI · Issue #2770 · portainer/portainer · GitHub

https://github.com/portainer/portainer/issues/2770
GitHub commit

commit d2b56efcb4e4 (portainer/portainer)

Fix landed in portainer/portainer commit d2b56efcb4e4 — awaiting tagged release

https://github.com/portainer/portainer/commit/d2b56efcb4e43c4168bb6688eee9f6bf22867312
GitHub commit

commit 49f19107cf9a (portainer/portainer)

Fix landed in portainer/portainer commit 49f19107cf9a — awaiting tagged release

https://github.com/portainer/portainer/commit/49f19107cf9a3540cbe406c9eb7f24390e1af02b

Vendor Advisories for CVE-2026-55761(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/portainer/portainer—
  • 2.39.0 up to 2.39.4: fixed in 2.39.4
  • 2.40.0 up to 2.43.0: fixed in 2.43.0
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 34× 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 132 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 32 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-01 16:12 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-28 13:24 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 75 more
  1. 2026-09-24 11:52 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-09-23 06:11 UTCEG score recompute
  4. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-09-18 05:45 UTCEG score recompute
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-09-14 08:55 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-09-13 08:25 UTCEG score recompute
  13. 2026-09-12 03:36 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-05 22:49 UTCEG score recompute
  20. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-08-30 07:37 UTCEG score recompute
  26. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  27. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-08-27 21:51 UTCEG score recompute
  29. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  30. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-08-26 08:25 UTCEG score recompute
  32. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  33. 2026-08-25 07:03 UTCEG score recompute
  34. 2026-08-23 05:19 UTCEG score recompute
  35. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-08-22 04:43 UTCEG score recompute
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-08-21 03:59 UTCEG score recompute
  39. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  40. 2026-08-20 02:00 UTCEG score recompute
  41. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  42. 2026-08-19 00:17 UTCEG score recompute
  43. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  44. 2026-08-17 23:47 UTCEG score recompute
  45. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-08-16 23:17 UTCEG score recompute
  47. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  49. 2026-08-15 22:47 UTCEG score recompute
  50. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  51. 2026-08-14 22:16 UTCEG score recompute
  52. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  53. 2026-08-12 21:17 UTCEG score recompute
  54. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  55. 2026-08-11 20:47 UTCEG score recompute
  56. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-08-09 19:47 UTCEG score recompute
  58. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-07 18:48 UTCEG score recompute
  60. 2026-08-06 18:18 UTCEG score recompute
  61. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  62. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  63. 2026-08-04 17:17 UTCEG score recompute
  64. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  66. 2026-08-02 16:17 UTCEG score recompute
  67. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  68. 2026-08-01 15:47 UTCEG score recompute
  69. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  70. 2026-07-31 15:16 UTCEG score recompute
  71. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  72. 2026-07-30 14:46 UTCEG score recompute
  73. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  74. 2026-07-29 14:13 UTCEG score recompute
  75. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55761?
CVE-2026-55761 is a medium-severity vulnerability; its CVE record was published on July 8, 2026. Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. In versions 2.39.0 through 2.39.3 and 2.40.0 until 2.43.0, unauthenticated restore and administrator initialization…
When was the CVE record for CVE-2026-55761 published?
The CVE record for CVE-2026-55761 was published on July 8, 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 July 10, 2026; the record at its source may have been updated since.
Is CVE-2026-55761 actively exploited?
CVE-2026-55761 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55761?
CVE-2026-55761 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-55761?
A fix for CVE-2026-55761 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55761 are linked in the Vendor Advisories panel on this page.

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