CVE-2026-0663: Denial-of-service vulnerability in M-Files Server versions before 26.1.15632.3 allows an authenticated attacke

Q: How do I fix CVE-2026-0663?

m-files server: upgrade to 26.1.15632.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-0663 being exploited?

CVE-2026-0663 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-2026-0663 affect?

CVE-2026-0663 affects m-files server. Severity is medium (CVSS 4.9). Denial-of-service vulnerability in M-Files Server versions before 26.1.15632.3 allows an authenticated attacker with vault administrator privileges to crash the M-Files Server process by calling a vulnerable API endpoint.

Q: How urgent is CVE-2026-0663?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2026-0663 is a medium-severity flaw (CVSS 4.9) affecting m-files server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Denial-of-service vulnerability in M-Files Server versions before 26.1.15632.3 allows an authenticated attacker with vault administrator privileges to crash the M-Files Server process by calling a vulnerable API endpoint.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-1286
Published	2026-01-21
Last modified	2026-06-17

Publisher (CNA): M-Files Corporation · Vendor: m-files

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-21 11:15 UTCPublished CVE record published
2026-06-17 10:11 UTCUpdated Record last modified

m-files m-files server UPGRADE

Affected: < 26.1.15632.3

Fixed in: 26.1.15632.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy m-files-server || rpm -q m-files-server || m-files-server --version

2. UPGRADE to 26.1.15632.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade m-files-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade m-files-server

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-2026-0663?

m-files server: upgrade to 26.1.15632.3. Exact commands for each OS are on this page.

Is CVE-2026-0663 being exploited?

CVE-2026-0663 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-2026-0663 affect?

CVE-2026-0663 affects m-files server. Severity is medium (CVSS 4.9). Denial-of-service vulnerability in M-Files Server versions before 26.1.15632.3 allows an authenticated attacker with vault administrator privileges to crash the M-Files Server process by calling a vulnerable API endpoint.

How urgent is CVE-2026-0663?

Priority 26/100. No elevated risk signals yet.

Software pages

HashiCorp Vault vulnerabilities

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References

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