CVE-2026-55761

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

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

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
5.9(medium)
EPSS
19.1%
KEV
Not listed

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 Patch Available

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
generic

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 24× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 08:06 UTCEG score recompute
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 07:37 UTCEG score recompute
  7. 2026-07-13 22:31 UTCEPSS rescore
  8. 2026-07-13 07:07 UTCEG score recompute
  9. 2026-07-13 06:13 UTCEPSS rescore
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-12 06:36 UTCEG score recompute
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-11 06:06 UTCEG score recompute▼ 1.20
  16. 2026-07-10 18:19 UTCNVD updateCVSS v3 → 5.9 · severity → MEDIUM
  17. 2026-07-10 17:38 UTCEG score recompute
  18. 2026-07-10 05:11 UTCEG score recompute
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 16:44 UTCEG score recompute
  22. 2026-07-09 04:15 UTCEG score recompute
  23. 2026-07-08 15:46 UTCEG score recompute
  24. 2026-07-08 15:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55761?
CVE-2026-55761 is a medium vulnerability 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 CVE-2026-55761 disclosed?
CVE-2026-55761 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55761 actively exploited?
CVE-2026-55761 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55761, 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.

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