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CVE-2026-6866: CWE-1188 Initialization of a Resource with an Insecure Default vulnerability exists that could cause unauthori

37
Routine
HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-6866 is a high-severity flaw (CVSS 7.5) affecting ecostruxure panel server pas400 firmware, ecostruxure panel server pas600 firmware, ecostruxure panel server pas600v2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CWE-1188 Initialization of a Resource with an Insecure Default vulnerability exists that could cause unauthorized disclosure of sensitive information when credentials revert to initial settings in rare circumstances, enabling unauthorized authentication using known credentials.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 78%)
CISA exploited listNo
WeaknessCWE-1188
Published2026-05-12
Last modified2026-10-26
Publisher (CNA): Schneider Electric SE · Vendor: schneider-electric

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Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

schneider-electric ecostruxure panel server pas400 firmware UPGRADE
Affected: < 002.006.000
Fixed in: 002.006.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
schneider-electric ecostruxure panel server pas600 firmware UPGRADE
Affected: < 002.006.000
Fixed in: 002.006.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
schneider-electric ecostruxure panel server pas600v2 firmware UPGRADE
Affected: < 002.006.000
Fixed in: 002.006.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
schneider-electric ecostruxure panel server pas800 firmware UPGRADE
Affected: < 002.006.000
Fixed in: 002.006.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
schneider-electric ecostruxure panel server pas800v2 firmware UPGRADE
Affected: < 002.006.000
Fixed in: 002.006.000
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6866?

ecostruxure panel server pas400 firmware: upgrade to 002.006.000; ecostruxure panel server pas600 firmware: upgrade to 002.006.000; ecostruxure panel server pas600v2 firmware: upgrade to 002.006.000. Exact commands for each OS are on this page.

Is CVE-2026-6866 being exploited?

CVE-2026-6866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6866 affect?

CVE-2026-6866 affects ecostruxure panel server pas400 firmware, ecostruxure panel server pas600 firmware, ecostruxure panel server pas600v2 firmware. Severity is high (CVSS 7.5). CWE-1188 Initialization of a Resource with an Insecure Default vulnerability exists that could cause unauthorized disclosure of sensitive information when credentials revert to initial settings in rare circumstances, enabling unauthorized a

How urgent is CVE-2026-6866?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Software pages

Schneider Electric vulnerabilities

References

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