CVE-2025-66593: An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write

Q: How do I fix CVE-2025-66593?

assistant: upgrade to 7.0.6-50085. Exact commands for each OS are on this page.

Q: Is CVE-2025-66593 being exploited?

CVE-2025-66593 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-2025-66593 affect?

CVE-2025-66593 affects assistant. Severity is medium (CVSS 6.1). An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

Q: How urgent is CVE-2025-66593?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2025-66593 is a medium-severity flaw (CVSS 6.1) affecting assistant. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 100%)
CISA exploited list	No
Weakness	CWE-346
Published	2026-05-27
Last modified	2026-10-07

Publisher (CNA): Synology Inc. · Vendor: synology

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 09:16 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

synology assistant UPGRADE

Affected: < 7.0.6-50085

Fixed in: 7.0.6-50085

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy assistant || rpm -q assistant || assistant --version

2. UPGRADE to 7.0.6-50085 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade assistant

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade assistant

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-2025-66593?

assistant: upgrade to 7.0.6-50085. Exact commands for each OS are on this page.

Is CVE-2025-66593 being exploited?

CVE-2025-66593 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-2025-66593 affect?

CVE-2025-66593 affects assistant. Severity is medium (CVSS 6.1). An origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

How urgent is CVE-2025-66593?

Priority 21/100. No elevated risk signals yet.

Software pages

Synology vulnerabilities

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References

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