CVE-2026-2399: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists tha

Q: How do I fix CVE-2026-2399?

powerchute serial shutdown: upgrade to 1.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-2399 being exploited?

CVE-2026-2399 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-2399 affect?

CVE-2026-2399 affects powerchute serial shutdown. Severity is medium (CVSS 6.1). CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists that could cause critical files overwritten with text data when a Web Admin user alters the POST /REST/upssleep request payload.

Q: How urgent is CVE-2026-2399?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-2399 is a medium-severity flaw (CVSS 6.1) affecting powerchute serial shutdown. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists that could cause critical files overwritten with text data when a Web Admin user alters the POST /REST/upssleep request payload.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-14
Last modified	2026-10-26

Publisher (CNA): Schneider Electric SE · Vendor: schneider-electric

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

Am I affected?

Timeline

2026-04-14 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

schneider-electric powerchute serial shutdown UPGRADE

Affected: < 1.5

Fixed in: 1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy powerchute-serial-shutdown || rpm -q powerchute-serial-shutdown || powerchute-serial-shutdown --version

2. UPGRADE to 1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade powerchute-serial-shutdown

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade powerchute-serial-shutdown

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-2399?

powerchute serial shutdown: upgrade to 1.5. Exact commands for each OS are on this page.

Is CVE-2026-2399 being exploited?

CVE-2026-2399 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-2026-2399 affect?

CVE-2026-2399 affects powerchute serial shutdown. Severity is medium (CVSS 6.1). CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists that could cause critical files overwritten with text data when a Web Admin user alters the POST /REST/upssleep request payload.

How urgent is CVE-2026-2399?

Priority 24/100. No elevated risk signals yet.

Software pages

Schneider Electric vulnerabilities

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References

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